Types of eyeglasses
Types of eyeglasses
1.Corrective
Corrective lenses modify the focal length of the eye to alleviate the effects of nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. As people age, the eye's crystalline lens loses elasticity, resulting in presbyopia, which limits their ability to change focus.
The power of a lens is generally measured in diopters. Over-the-counter reading glasses are typically rated at +1.00 to +4.00 diopters. Glasses correcting for myopia will have negative diopter strengths. Lenses made to conform to the prescription of an ophthalmologist or optometrist are called prescription lenses and are used to make prescription glasses.
2.Safety
Safety glasses are usually made with shatter-resistant plastic lenses to protect the eye from flying debris. Although safety lenses may be constructed from a variety of materials of various impact resistance, certain standards suggest that they maintain a minimum 1 millimeter thickness at the thinnest point, regardless of material. Safety glasses can vary in the level of protection they provide. For example, those used in medicine may be expected to protect against blood splatter while safety glasses in a factory might have stronger lenses and a stronger frame with additional shields at the temples. The lenses of safety glasses can also be shaped for correction.
The American National Standards Institute has established standard ANSI Z87.1 for safety glasses in the United States, and similar standards have been established elsewhere.
OSHA provides guidance on the type of safety eyewear that should be used for a particular application.
Some safety glasses are designed to fit over corrective glasses or sunglasses. They may provide less eye protection than goggles or other forms of eye protection, but their light weight increases the likelihood that they will actually be used. Modern safety glasses tend to be given a more stylish design in order to encourage their use. Corrective glasses with plastic lenses can be used in the place of safety glasses in many environments; this is one advantage that they have over contact lenses.
There are also safety glasses for welding, which are styled like wraparound sunglasses, but with much darker lenses, for use in welding where a full sized welding helmet is inconvenient or uncomfortable. These are often called "flash goggles", because they provide protection from welding flash.
Worker safety eyewear is available in various lens colors and/or with coatings to protect or enable eyesight in different lighting conditions, particularly when outdoors.
Nylon frames are usually used for protection eyewear for sports because of their lightweight and flexible properties. They are able to bend slightly and return to their original shape instead of breaking when pressure is applied to them. Nylon frames can become very brittle with age and they can be difficult to adjust.
3.Sunglasses
Sunglasses may be made with either prescription or non-prescription lenses that are darkened to provide protection against bright visible and possibly ultraviolet light.
Glasses with photosensitive lenses, called photochromic lenses, become darker in the presence of UV light. Unfortunately, many car windshields block the passage of UV light, making photochromic lenses less effective whilst driving on bright days. Still, they offer the convenience of not having to carry both clear glasses and sunglasses to those who frequently go indoors and outdoors during the course of a day.
Light polarization is an added feature that can be applied to sunglass lenses. Polarization filters remove horizontal rays of light, which can cause glare. Popular among fishermen and hunters, polarized sunglasses allow wearers to see into water when normally glare or reflected light would be seen. Polarized sunglasses may present some difficulties for pilots since reflections from water and other structures often used to gauge altitude may be removed, or instrument readings on liquid crystal displays may be blocked.
Yellow lenses are commonly used by golfers and shooters for their contrast enhancement and depth perception properties. Brown lenses are also common among golfers, but cause color distortion. Blue, purple, and green lenses offer no real benefits to vision enhancement and are mainly cosmetic. Some sunglasses with interchangeable lenses have optional clear lenses to protect the eyes during low light or night time activities and a colored lens with UV protection for times where sun protection is needed. Debate exists as to whether "blue blocking" or amber tinted lenses have a protective effect.
Sunglasses are often worn just for aesthetic purposes, or simply to hide the eyes. Examples of sunglasses that were popular for these reasons include teashades and mirrorshades.
4.Special
The illusion of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses create the illusion of three dimensions when viewing specially prepared images. The classic 3D glasses have one red lens and one blue lens. 3D glasses made of cardboard and plastic are distributed at 3D movies. Another kind of 3D glasses uses polarized filters, with one lens polarized vertically and the other horizontally, with the two images required for stereo vision polarized the same way. Polarized 3D glasses allow for color 3D, while the red-blue lenses produce a dull black-and-white picture with red and blue fringes.
One kind of electronic 3D spectacles uses electronic shutters, while virtual reality glasses and helmets have separate video screens for each eye.
1.Corrective
Corrective lenses modify the focal length of the eye to alleviate the effects of nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. As people age, the eye's crystalline lens loses elasticity, resulting in presbyopia, which limits their ability to change focus.
The power of a lens is generally measured in diopters. Over-the-counter reading glasses are typically rated at +1.00 to +4.00 diopters. Glasses correcting for myopia will have negative diopter strengths. Lenses made to conform to the prescription of an ophthalmologist or optometrist are called prescription lenses and are used to make prescription glasses.
2.Safety
Safety glasses are usually made with shatter-resistant plastic lenses to protect the eye from flying debris. Although safety lenses may be constructed from a variety of materials of various impact resistance, certain standards suggest that they maintain a minimum 1 millimeter thickness at the thinnest point, regardless of material. Safety glasses can vary in the level of protection they provide. For example, those used in medicine may be expected to protect against blood splatter while safety glasses in a factory might have stronger lenses and a stronger frame with additional shields at the temples. The lenses of safety glasses can also be shaped for correction.
The American National Standards Institute has established standard ANSI Z87.1 for safety glasses in the United States, and similar standards have been established elsewhere.
OSHA provides guidance on the type of safety eyewear that should be used for a particular application.
Some safety glasses are designed to fit over corrective glasses or sunglasses. They may provide less eye protection than goggles or other forms of eye protection, but their light weight increases the likelihood that they will actually be used. Modern safety glasses tend to be given a more stylish design in order to encourage their use. Corrective glasses with plastic lenses can be used in the place of safety glasses in many environments; this is one advantage that they have over contact lenses.
There are also safety glasses for welding, which are styled like wraparound sunglasses, but with much darker lenses, for use in welding where a full sized welding helmet is inconvenient or uncomfortable. These are often called "flash goggles", because they provide protection from welding flash.
Worker safety eyewear is available in various lens colors and/or with coatings to protect or enable eyesight in different lighting conditions, particularly when outdoors.
Nylon frames are usually used for protection eyewear for sports because of their lightweight and flexible properties. They are able to bend slightly and return to their original shape instead of breaking when pressure is applied to them. Nylon frames can become very brittle with age and they can be difficult to adjust.
3.Sunglasses
Sunglasses may be made with either prescription or non-prescription lenses that are darkened to provide protection against bright visible and possibly ultraviolet light.
Glasses with photosensitive lenses, called photochromic lenses, become darker in the presence of UV light. Unfortunately, many car windshields block the passage of UV light, making photochromic lenses less effective whilst driving on bright days. Still, they offer the convenience of not having to carry both clear glasses and sunglasses to those who frequently go indoors and outdoors during the course of a day.
Light polarization is an added feature that can be applied to sunglass lenses. Polarization filters remove horizontal rays of light, which can cause glare. Popular among fishermen and hunters, polarized sunglasses allow wearers to see into water when normally glare or reflected light would be seen. Polarized sunglasses may present some difficulties for pilots since reflections from water and other structures often used to gauge altitude may be removed, or instrument readings on liquid crystal displays may be blocked.
Yellow lenses are commonly used by golfers and shooters for their contrast enhancement and depth perception properties. Brown lenses are also common among golfers, but cause color distortion. Blue, purple, and green lenses offer no real benefits to vision enhancement and are mainly cosmetic. Some sunglasses with interchangeable lenses have optional clear lenses to protect the eyes during low light or night time activities and a colored lens with UV protection for times where sun protection is needed. Debate exists as to whether "blue blocking" or amber tinted lenses have a protective effect.
Sunglasses are often worn just for aesthetic purposes, or simply to hide the eyes. Examples of sunglasses that were popular for these reasons include teashades and mirrorshades.
4.Special
The illusion of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses create the illusion of three dimensions when viewing specially prepared images. The classic 3D glasses have one red lens and one blue lens. 3D glasses made of cardboard and plastic are distributed at 3D movies. Another kind of 3D glasses uses polarized filters, with one lens polarized vertically and the other horizontally, with the two images required for stereo vision polarized the same way. Polarized 3D glasses allow for color 3D, while the red-blue lenses produce a dull black-and-white picture with red and blue fringes.
One kind of electronic 3D spectacles uses electronic shutters, while virtual reality glasses and helmets have separate video screens for each eye.
Types of eyeglasses
Types of eyeglasses
1.Corrective
Corrective lenses modify the focal length of the eye to alleviate the effects of nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. As people age, the eye's crystalline lens loses elasticity, resulting in presbyopia, which limits their ability to change focus.
The power of a lens is generally measured in diopters. Over-the-counter reading glasses are typically rated at +1.00 to +4.00 diopters. Glasses correcting for myopia will have negative diopter strengths. Lenses made to conform to the prescription of an ophthalmologist or optometrist are called prescription lenses and are used to make prescription glasses.
2.Safety
Safety glasses are usually made with shatter-resistant plastic lenses to protect the eye from flying debris. Although safety lenses may be constructed from a variety of materials of various impact resistance, certain standards suggest that they maintain a minimum 1 millimeter thickness at the thinnest point, regardless of material. Safety glasses can vary in the level of protection they provide. For example, those used in medicine may be expected to protect against blood splatter while safety glasses in a factory might have stronger lenses and a stronger frame with additional shields at the temples. The lenses of safety glasses can also be shaped for correction.
The American National Standards Institute has established standard ANSI Z87.1 for safety glasses in the United States, and similar standards have been established elsewhere.
OSHA provides guidance on the type of safety eyewear that should be used for a particular application.
Some safety glasses are designed to fit over corrective glasses or sunglasses. They may provide less eye protection than goggles or other forms of eye protection, but their light weight increases the likelihood that they will actually be used. Modern safety glasses tend to be given a more stylish design in order to encourage their use. Corrective glasses with plastic lenses can be used in the place of safety glasses in many environments; this is one advantage that they have over contact lenses.
There are also safety glasses for welding, which are styled like wraparound sunglasses, but with much darker lenses, for use in welding where a full sized welding helmet is inconvenient or uncomfortable. These are often called "flash goggles", because they provide protection from welding flash.
Worker safety eyewear is available in various lens colors and/or with coatings to protect or enable eyesight in different lighting conditions, particularly when outdoors.
Nylon frames are usually used for protection eyewear for sports because of their lightweight and flexible properties. They are able to bend slightly and return to their original shape instead of breaking when pressure is applied to them. Nylon frames can become very brittle with age and they can be difficult to adjust.
3.Sunglasses
Sunglasses may be made with either prescription or non-prescription lenses that are darkened to provide protection against bright visible and possibly ultraviolet light.
Glasses with photosensitive lenses, called photochromic lenses, become darker in the presence of UV light. Unfortunately, many car windshields block the passage of UV light, making photochromic lenses less effective whilst driving on bright days. Still, they offer the convenience of not having to carry both clear glasses and sunglasses to those who frequently go indoors and outdoors during the course of a day.
Light polarization is an added feature that can be applied to sunglass lenses. Polarization filters remove horizontal rays of light, which can cause glare. Popular among fishermen and hunters, polarized sunglasses allow wearers to see into water when normally glare or reflected light would be seen. Polarized sunglasses may present some difficulties for pilots since reflections from water and other structures often used to gauge altitude may be removed, or instrument readings on liquid crystal displays may be blocked.
Yellow lenses are commonly used by golfers and shooters for their contrast enhancement and depth perception properties. Brown lenses are also common among golfers, but cause color distortion. Blue, purple, and green lenses offer no real benefits to vision enhancement and are mainly cosmetic. Some sunglasses with interchangeable lenses have optional clear lenses to protect the eyes during low light or night time activities and a colored lens with UV protection for times where sun protection is needed. Debate exists as to whether "blue blocking" or amber tinted lenses have a protective effect.
Sunglasses are often worn just for aesthetic purposes, or simply to hide the eyes. Examples of sunglasses that were popular for these reasons include teashades and mirrorshades.
4.Special
The illusion of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses create the illusion of three dimensions when viewing specially prepared images. The classic 3D glasses have one red lens and one blue lens. 3D glasses made of cardboard and plastic are distributed at 3D movies. Another kind of 3D glasses uses polarized filters, with one lens polarized vertically and the other horizontally, with the two images required for stereo vision polarized the same way. Polarized 3D glasses allow for color 3D, while the red-blue lenses produce a dull black-and-white picture with red and blue fringes.
One kind of electronic 3D spectacles uses electronic shutters, while virtual reality glasses and helmets have separate video screens for each eye.
1.Corrective
Corrective lenses modify the focal length of the eye to alleviate the effects of nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. As people age, the eye's crystalline lens loses elasticity, resulting in presbyopia, which limits their ability to change focus.
The power of a lens is generally measured in diopters. Over-the-counter reading glasses are typically rated at +1.00 to +4.00 diopters. Glasses correcting for myopia will have negative diopter strengths. Lenses made to conform to the prescription of an ophthalmologist or optometrist are called prescription lenses and are used to make prescription glasses.
2.Safety
Safety glasses are usually made with shatter-resistant plastic lenses to protect the eye from flying debris. Although safety lenses may be constructed from a variety of materials of various impact resistance, certain standards suggest that they maintain a minimum 1 millimeter thickness at the thinnest point, regardless of material. Safety glasses can vary in the level of protection they provide. For example, those used in medicine may be expected to protect against blood splatter while safety glasses in a factory might have stronger lenses and a stronger frame with additional shields at the temples. The lenses of safety glasses can also be shaped for correction.
The American National Standards Institute has established standard ANSI Z87.1 for safety glasses in the United States, and similar standards have been established elsewhere.
OSHA provides guidance on the type of safety eyewear that should be used for a particular application.
Some safety glasses are designed to fit over corrective glasses or sunglasses. They may provide less eye protection than goggles or other forms of eye protection, but their light weight increases the likelihood that they will actually be used. Modern safety glasses tend to be given a more stylish design in order to encourage their use. Corrective glasses with plastic lenses can be used in the place of safety glasses in many environments; this is one advantage that they have over contact lenses.
There are also safety glasses for welding, which are styled like wraparound sunglasses, but with much darker lenses, for use in welding where a full sized welding helmet is inconvenient or uncomfortable. These are often called "flash goggles", because they provide protection from welding flash.
Worker safety eyewear is available in various lens colors and/or with coatings to protect or enable eyesight in different lighting conditions, particularly when outdoors.
Nylon frames are usually used for protection eyewear for sports because of their lightweight and flexible properties. They are able to bend slightly and return to their original shape instead of breaking when pressure is applied to them. Nylon frames can become very brittle with age and they can be difficult to adjust.
3.Sunglasses
Sunglasses may be made with either prescription or non-prescription lenses that are darkened to provide protection against bright visible and possibly ultraviolet light.
Glasses with photosensitive lenses, called photochromic lenses, become darker in the presence of UV light. Unfortunately, many car windshields block the passage of UV light, making photochromic lenses less effective whilst driving on bright days. Still, they offer the convenience of not having to carry both clear glasses and sunglasses to those who frequently go indoors and outdoors during the course of a day.
Light polarization is an added feature that can be applied to sunglass lenses. Polarization filters remove horizontal rays of light, which can cause glare. Popular among fishermen and hunters, polarized sunglasses allow wearers to see into water when normally glare or reflected light would be seen. Polarized sunglasses may present some difficulties for pilots since reflections from water and other structures often used to gauge altitude may be removed, or instrument readings on liquid crystal displays may be blocked.
Yellow lenses are commonly used by golfers and shooters for their contrast enhancement and depth perception properties. Brown lenses are also common among golfers, but cause color distortion. Blue, purple, and green lenses offer no real benefits to vision enhancement and are mainly cosmetic. Some sunglasses with interchangeable lenses have optional clear lenses to protect the eyes during low light or night time activities and a colored lens with UV protection for times where sun protection is needed. Debate exists as to whether "blue blocking" or amber tinted lenses have a protective effect.
Sunglasses are often worn just for aesthetic purposes, or simply to hide the eyes. Examples of sunglasses that were popular for these reasons include teashades and mirrorshades.
4.Special
The illusion of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses create the illusion of three dimensions when viewing specially prepared images. The classic 3D glasses have one red lens and one blue lens. 3D glasses made of cardboard and plastic are distributed at 3D movies. Another kind of 3D glasses uses polarized filters, with one lens polarized vertically and the other horizontally, with the two images required for stereo vision polarized the same way. Polarized 3D glasses allow for color 3D, while the red-blue lenses produce a dull black-and-white picture with red and blue fringes.
One kind of electronic 3D spectacles uses electronic shutters, while virtual reality glasses and helmets have separate video screens for each eye.
The Most Famous 5 Glasses-Desiging Studios For Fashion
This summer, I love wear fashion sunglasses, today i recommend five fashion design Glass Studios to everybody:
1. Rainbow Glass Studios designs and produces traditional and modern stained glass using various techniques for domestic, architectural and ecclesiastic applications . We specialise in leaded stained glass, fusing, sandblasting, acid etching, kiln formed casting and painting. We also offer day courses in stained glass and evening workshops. (rainbowglassstudios.co.uk)
2. Glassblowing studio of Artisit Newt Grover. Newt Glass specializes in site specific designs for commercial & residential nationwide. Lighted glass artwork is a specialty. (newtglass.com)
3. We design and create contemporary fused glass jewelery, wall and table sculptures, tiles, plates, platters, large panels, lighting and tiki art. We also have a custom program to suit individual tastes. (creativeglassworksaz.com)
4. Custom blown and sculpted glass made to order for architectural accents and artistic collections. Focus is custom glass lighting, chandeliers, pendants and lighted sculptures. Other artworks and design accessories available. (illuminataglass.com)
5. Norberto Morettis website: the outstanding expression of an artist and artisan (craftsman), through incredible artworks, decorative objects and projects, the interpretation of Murano glass and soul. (norbertomoretti.com)
I suggest you go to the Sunglasses On Sale website to find fashion design SunGlasses, which now including Christian Dior, Coach, D&G, Emporio Armani, Giorgio Armani, Gucci, Marc Jacobs, Oakley, Polo, Prada, Ray Ban, Valentino, Versace sunglasses and so on.
kids eyeglasses:
kids eyeglasses:
First, the eye exam - that is often the easy part. Most children do not need spectacles. If your child does need spectacles good advice and a great range of frames and lenses are available. It does not need to be confusing. Several tips can make your visit a little easier.
The most important aspect of a pair of glasses is how they fit. Children's glasses are not miniature versions of adult glasses. Grown-up noses and cheeks are proportioned differently than children's, and spectacle frames need to reflect this in order to fit properly. Experienced children's opticians keep these differences in mind when assisting you in choosing eyewear.
Take our advice. Your child is much more likely to wear his or her glasses if they are comfortable and fit properly. That way they will look through the right part of the lens and will see better.
Remember that your child is undergoing rapid growth and an improperly fitted frame can cause alterations in developing bone, breathing problems and even create further damage in the vision - a problem the glasses are supposed to correct.
As a child grows, the nose and cheeks change in shape and prominence, so don't expect a child to "grow into" a pair of glasses. Ordering glasses "a little bit too big" can cause discomfort, inadequate vision and the frames slide down the nose. By the time they "grow into" the frame, it will no longer fit due to changes in facial features.
Because they are more active, children are going to be tougher on their glasses, so look for good quality metal or plastic frames with flexible spring hinges - and a good warranty! All of our frames come with a 12 month guarantee against manufacturing faults. Some ranges also come with a 2 year guarantee. Please ask us for details when you come. It is worth spending a little more to get a better quality frame with a good guarantee. It often leads to savings in the long term.
Lenses made of polycarbonate, a very strong plastic are a must. Regular plastic and glass lenses can shatter into shards that can lacerate delicate eye tissue.
Polycarbonate lenses are more shatter resistant and therefore much safer. Of course, any lens can scratch if not cared for properly, so here again it's a good idea to compare warranties on lenses. Spectacle lenses can be replaced; children’s eyes can’t.
Often the biggest initial concern of a parent is whether their child will wear the glasses once they've received them. If a child sees better out of the glasses, at least up to the age of ten, there probably won't be any problem, even with toddlers.
If you are having trouble getting your child to keep their glasses on, first check to see if the glasses fit properly. Children tend not to complain about sore ears and noses as an adult might, so check for redness behind the ears or on the sides of the nose to be sure the frames aren't rubbing uncomfortably or sliding around.
Make sure the glasses aren't falling down on the nose, which can cause distorted and decreased vision. Often it only takes a simple adjustment of the nose pads or ear pieces to make things comfortable again.
If you are still meeting with resistance and the glasses are fitting well, a re-check visit with the prescribing optometrist may be necessary to be sure the child is seeing well through the lens power that was prescribed.
Glasses for children are often like "medicine," and sometimes the strength of the "medicine," or lenses, needs to be adjusted to get the desired results.
If the frame fit and vision is not the problem, your child may be unhappy with the appearance of the glasses. This can be avoided with some tricks in the initial stages of frame selection.
First, let your child have some input in deciding on the glasses. Frames they help to select are more apt to be worn than those selected without their input. There are more important things in your child's life to argue about than frame colour. Remember that most frames are made in several different colours. If you can’t see what you are looking for, ask us.
Second, if your child has a strong prescription the glasses can look thick and uncomfortably heavy. Talk to your optician about special polycarbonate lenses in an aspheric design which cut down on thickness, weight and distortion. In stronger prescriptions, these lenses are more cosmetically pleasing.
Anti-reflective coatings on the lenses not only cut down on discomforting glare but also remove reflections from the front of the lenses, again making the glasses more cosmetically acceptable. All these options add to the price of the glasses, but paying a little more for eyewear that will be worn is a better investment than getting a pair of glasses that end up shoved in the back of a drawer.
Our video system will help to decide even when your child cannot see without their lenses. We will take a photograph of each choice and they can see how others will see them. If the system is not offered and you want to try it - ASK. We will be pleased to show off our little bit of technology.
If, after all this you are still having arguments with your child about wearing glasses, there are a few persuaders left. Try to find some pictures of bespectacled sports figures or film stars that your child admires to serve as role models.
Make sure you wear your glasses if you need them - even go so far as putting your contact lenses away for a couple of weeks in order to set an example for your child to follow. Find old pictures of yourself, friends or relatives when they were kids with their first pair of glasses.
This can be a lot of fun for everyone and can make your child realise just what great looking glasses they have! You can even throw an eyeglass party and invite all your child's friends to "celebrate" the new glasses.
Remember, your child's visual development affects growth and development in many other areas. Get the best for your child. Seek our advice.
First, the eye exam - that is often the easy part. Most children do not need spectacles. If your child does need spectacles good advice and a great range of frames and lenses are available. It does not need to be confusing. Several tips can make your visit a little easier.
The most important aspect of a pair of glasses is how they fit. Children's glasses are not miniature versions of adult glasses. Grown-up noses and cheeks are proportioned differently than children's, and spectacle frames need to reflect this in order to fit properly. Experienced children's opticians keep these differences in mind when assisting you in choosing eyewear.
Take our advice. Your child is much more likely to wear his or her glasses if they are comfortable and fit properly. That way they will look through the right part of the lens and will see better.
Remember that your child is undergoing rapid growth and an improperly fitted frame can cause alterations in developing bone, breathing problems and even create further damage in the vision - a problem the glasses are supposed to correct.
As a child grows, the nose and cheeks change in shape and prominence, so don't expect a child to "grow into" a pair of glasses. Ordering glasses "a little bit too big" can cause discomfort, inadequate vision and the frames slide down the nose. By the time they "grow into" the frame, it will no longer fit due to changes in facial features.
Because they are more active, children are going to be tougher on their glasses, so look for good quality metal or plastic frames with flexible spring hinges - and a good warranty! All of our frames come with a 12 month guarantee against manufacturing faults. Some ranges also come with a 2 year guarantee. Please ask us for details when you come. It is worth spending a little more to get a better quality frame with a good guarantee. It often leads to savings in the long term.
Lenses made of polycarbonate, a very strong plastic are a must. Regular plastic and glass lenses can shatter into shards that can lacerate delicate eye tissue.
Polycarbonate lenses are more shatter resistant and therefore much safer. Of course, any lens can scratch if not cared for properly, so here again it's a good idea to compare warranties on lenses. Spectacle lenses can be replaced; children’s eyes can’t.
Often the biggest initial concern of a parent is whether their child will wear the glasses once they've received them. If a child sees better out of the glasses, at least up to the age of ten, there probably won't be any problem, even with toddlers.
If you are having trouble getting your child to keep their glasses on, first check to see if the glasses fit properly. Children tend not to complain about sore ears and noses as an adult might, so check for redness behind the ears or on the sides of the nose to be sure the frames aren't rubbing uncomfortably or sliding around.
Make sure the glasses aren't falling down on the nose, which can cause distorted and decreased vision. Often it only takes a simple adjustment of the nose pads or ear pieces to make things comfortable again.
If you are still meeting with resistance and the glasses are fitting well, a re-check visit with the prescribing optometrist may be necessary to be sure the child is seeing well through the lens power that was prescribed.
Glasses for children are often like "medicine," and sometimes the strength of the "medicine," or lenses, needs to be adjusted to get the desired results.
If the frame fit and vision is not the problem, your child may be unhappy with the appearance of the glasses. This can be avoided with some tricks in the initial stages of frame selection.
First, let your child have some input in deciding on the glasses. Frames they help to select are more apt to be worn than those selected without their input. There are more important things in your child's life to argue about than frame colour. Remember that most frames are made in several different colours. If you can’t see what you are looking for, ask us.
Second, if your child has a strong prescription the glasses can look thick and uncomfortably heavy. Talk to your optician about special polycarbonate lenses in an aspheric design which cut down on thickness, weight and distortion. In stronger prescriptions, these lenses are more cosmetically pleasing.
Anti-reflective coatings on the lenses not only cut down on discomforting glare but also remove reflections from the front of the lenses, again making the glasses more cosmetically acceptable. All these options add to the price of the glasses, but paying a little more for eyewear that will be worn is a better investment than getting a pair of glasses that end up shoved in the back of a drawer.
Our video system will help to decide even when your child cannot see without their lenses. We will take a photograph of each choice and they can see how others will see them. If the system is not offered and you want to try it - ASK. We will be pleased to show off our little bit of technology.
If, after all this you are still having arguments with your child about wearing glasses, there are a few persuaders left. Try to find some pictures of bespectacled sports figures or film stars that your child admires to serve as role models.
Make sure you wear your glasses if you need them - even go so far as putting your contact lenses away for a couple of weeks in order to set an example for your child to follow. Find old pictures of yourself, friends or relatives when they were kids with their first pair of glasses.
This can be a lot of fun for everyone and can make your child realise just what great looking glasses they have! You can even throw an eyeglass party and invite all your child's friends to "celebrate" the new glasses.
Remember, your child's visual development affects growth and development in many other areas. Get the best for your child. Seek our advice.
How the Eye Works
How the Eye Works
The eye is a small, but very complex organ. Sight is created when our eyes interact with light and then transfer that information to the brain.
The main parts of the eye include:
Cornea: transparent tissue covering the front of the eye that lets light travel through
Iris: a ring of muscles in the colored part of the eye that controls the size of the pupilPupil: an opening in the center of the iris that changes size to control how much light is entering the eye.
Sclera: the white part of the eye that is composed of fibrous tissue that protects the inner workings of the eye
Lens: located directly behind the pupil, it focuses light rays onto the retina
Retina: changes light that enters the eye into nerve signals
Rods and cones: special cells used by the retina to process light
Fovea: a tiny spot in the center of the retina that contains only cone cells. It allows us to see things sharply.
Optic Nerve: a bundle of nerve fibers that carries messages from the eyes to the brain
Macula: a small and highly sensitive part of the retina responsible for central vision, which allows a person to see shapes, colors, and details clearly and sharply.
How We See
Light hits an object and reflects off of it. The light then passes through the cornea. The iris regulates the amount of light that enters the eye through the pupil. The lens then focuses the light on the retina. Because of its curved structure, the lens flips the image before projecting it onto the retina. Next, the rods and cones become excited and the optic nerve carries the message to the brain.
Depending on the shape of the eyeball, the cornea, lens, and retina may not work perfectly together, causing fuzzy vision. That is why many people need vision correction. Eyeglasses and contact lenses help the light focus images correctly on the retina and allow people to see clearly.
Medication or Procedure-Related Eye Sensitivities
Almost everyone experiences eye problems from time to time. Your eyes might sometimes look or feel strained, dry, bloodshot, or itchy. They could also be particularly sensitive to light due to certain medications you are taking or medical conditions you have. Also, if you have recently gone through procedures such as surgery to remove cataracts, your eyes will need extra protection.
Consult your eyecare professional for any problems that last more than a day or two or to determine the best way to protect your eyes from excess light and from UV radiation
The eye is a small, but very complex organ. Sight is created when our eyes interact with light and then transfer that information to the brain.
The main parts of the eye include:
Cornea: transparent tissue covering the front of the eye that lets light travel through
Iris: a ring of muscles in the colored part of the eye that controls the size of the pupilPupil: an opening in the center of the iris that changes size to control how much light is entering the eye.
Sclera: the white part of the eye that is composed of fibrous tissue that protects the inner workings of the eye
Lens: located directly behind the pupil, it focuses light rays onto the retina
Retina: changes light that enters the eye into nerve signals
Rods and cones: special cells used by the retina to process light
Fovea: a tiny spot in the center of the retina that contains only cone cells. It allows us to see things sharply.
Optic Nerve: a bundle of nerve fibers that carries messages from the eyes to the brain
Macula: a small and highly sensitive part of the retina responsible for central vision, which allows a person to see shapes, colors, and details clearly and sharply.
How We See
Light hits an object and reflects off of it. The light then passes through the cornea. The iris regulates the amount of light that enters the eye through the pupil. The lens then focuses the light on the retina. Because of its curved structure, the lens flips the image before projecting it onto the retina. Next, the rods and cones become excited and the optic nerve carries the message to the brain.
Depending on the shape of the eyeball, the cornea, lens, and retina may not work perfectly together, causing fuzzy vision. That is why many people need vision correction. Eyeglasses and contact lenses help the light focus images correctly on the retina and allow people to see clearly.
Medication or Procedure-Related Eye Sensitivities
Almost everyone experiences eye problems from time to time. Your eyes might sometimes look or feel strained, dry, bloodshot, or itchy. They could also be particularly sensitive to light due to certain medications you are taking or medical conditions you have. Also, if you have recently gone through procedures such as surgery to remove cataracts, your eyes will need extra protection.
Consult your eyecare professional for any problems that last more than a day or two or to determine the best way to protect your eyes from excess light and from UV radiation
Types of contact lenses
Types of contact lenses
Contact lenses are classified in many different manners.
By function
Corrective contact lenses
A corrective contact lens is a lens designed to improve vision. In many people, there is a mismatch between the refractive power of the eye and the length of the eye, leading to a refraction error. A contact lens neutralizes this mismatch and allows for correct focusing of light onto the retina. Conditions correctable with contact lenses include near (or short) sightedness (myopia), far (or long) sightedness (hypermetropia), astigmatism and presbyopia. Contact wearers must usually take their contacts out every night or every few days, depending on the brand and style of the contact. Recently there has been renewed interest in orthokeratology, the correction of myopia by deliberate overnight flattening of the cornea, leaving the eye without contact lens or eyeglasses correction during the day.
For those with certain color deficiencies, a red-tinted "X-Chrom" contact lens may be used. Although the lens does not restore normal color vision, it allows some colorblind individuals to distinguish colors better
ChromaGen lenses have been used and these have been shown to have some limitations with vision at night although otherwise producing significant improvements in colour vision.An earlier study showed very significant improvements in colour vision and patient satisfaction
Later work that used these ChromaGen lenses with dyslexics in a randomised, double-blind, placebo controlled trial showed highly significant improvements in reading ability over reading without the lenses This system has been granted FDA approval in the United States, which is reassuring to patients.
Cosmetic contact lenses
A cosmetic contact lens is designed to change the appearance of the eye. These lenses may also correct the vision, but some blurring or obstruction of vision may occur as a result of the color or design. In the United States, the FDA frequently calls non-corrective cosmetic contact lenses decorative contact lenses.
Theatrical contact lenses are a type of cosmetic contact lens that are used primarily in the entertainment industry to make the eye appear pleasing, unusual or unnatural in appearance, most often in horror and zombie movies, where lenses can make one's eyes appear demonic, cloudy and lifeless, or even to make the pupils of the wearer appear dilated to simulate the natural appearance of the pupils under the influence of various illicit drugs.
Scleral lenses cover the white part of the eye (i.e. sclera) and are used in many theatrical lenses..Due to their size, these lenses are difficult to insert and do not move very well within the eye. They may also hamper the vision as the lens has a small area for the user to see through. As a result they generally cannot be worn for more than 3 hours as they can cause temporary vision disturbances.
Similar lenses have more direct medical applications. For example, some lenses can give the iris an enlarged appearance, or mask defects such as absence (aniridia) or damage (dyscoria) to the iris.
Although many brands of contact lenses are lightly tinted to make them easier to handle, cosmetic lenses worn to change the color of the eye are far less common, accounting for only 3% of contact lens fits in 2004.
Therapeutic contact lenses
Soft lenses are often used in the treatment and management of non-refractive disorders of the eye. A bandage contact lens protects an injured or diseased cornea from the constant rubbing of blinking eyelids thereby allowing it to heal.They are used in the treatment of conditions including bullous keratopathy, dry eyes, corneal ulcers and erosion, keratitis, corneal edema, descemetocele, corneal ectasis, Mooren's ulcer, anterior corneal dystrophy, and neurotrophic keratoconjunctivitis. Contact lenses that deliver drugs to the eye have also been developed.
By constructional material
Contact lenses, other than the cosmetic variety, become almost invisible once inserted in the eyeThe first contact lenses were made of glass, which caused eye irritation, and were not wearable for extended periods of time. But when William Feinbloom introduced lenses made from polymethyl methacrylate (PMMA or Perspex/Plexiglas), contacts became much more convenient. These PMMA lenses are commonly referred to as "hard" lenses (this term is not used for other types of contacts).
However, PMMA lenses have their own side effects: no oxygen is transmitted through the lens to the cornea, which can cause a number of adverse clinical events. In the late 1970s, and through the 1980s and 1990s, improved rigid materials — which were also oxygen-permeable — were developed. Collectively, these polymers are referred to as rigid gas permeable or 'RGP' materials or lenses. One advantage of hard lenses is that, due to their non-porous nature, they do not absorb chemicals or fumes. The absorption of such compounds by other types of contacts can be a problem for those who are routinely exposed to painting or other chemical processes.
Rigid lenses offer a number of unique properties. In effect, the lens is able to replace the natural shape of the cornea with a new refracting surface. This means that a regular (spherical) rigid contact lens can provide good level of vision in people who have astigmatism or distorted corneal shapes as with keratoconus.
While rigid lenses have been around for about 120 years, soft lenses are a much more recent development. The principal breakthrough in soft lenses made by Otto Wichterle led to the launch of the first soft (hydrogel) lenses in some countries in the 1960s and the approval of the 'Soflens' material (polymacon) by the United States FDA in 1971. Soft lenses are immediately comfortable, while rigid lenses require a period of adaptation before full comfort is achieved. The polymers from which soft lenses are manufactured improved over the next 25 years, primarily in terms of increasing the oxygen permeability by varying the ingredients making up the polymers.
A small number of hybrid rigid/soft lenses exist. An alternative technique is piggybacking of contact lenses, a smaller, rigid lens being mounted atop a larger, soft lens. This is done for a variety of clinical situations where a single lens will not provide the optical power, fitting characteristics, or comfort required.
In 1999, 'silicone hydrogels' became available. Silicone hydrogels have both the extremely high oxygen permeability of silicone and the comfort and clinical performance of the conventional hydrogels. These lenses were initially advocated primarily for extended (overnight) wear, although more recently daily (no overnight) wear silicone hydrogels have been launched.
While it provides the oxygen permeability, the silicone also makes the lens surface highly hydrophobic and less "wettable." This frequently results in discomfort and dryness during lens wear. In order to compensate for the hydrophobicity, hydrogels are added (hence the name "silicone hydrogels") to make the lenses more hydrophilic. However the lens surface may still remain hydrophobic. Hence some of the lenses undergo surface modification processes which cover the hydrophobic sites of silicone. Some other lens types incorporate internal rewetting agents to make the lens surface hydrophilic.
By wear time
A daily wear contact lens is designed to be removed prior to sleeping. An extended wear (EW) contact lens is designed for continuous overnight wear, typically for 6 or more consecutive nights. Newer materials, such as silicone hydrogels, allow for even longer wear periods of up to 30 consecutive nights; these longer-wear lenses are often referred to as continuous wear (CW). Generally, extended wear lenses are discarded after the specified length of time. These are increasing in popularity, due to their obvious convenience. Extended- and continuous-wear contact lenses can be worn for such long periods of time because of their high oxygen permeability (typically 5-6 times greater than conventional soft lenses), which allows the eye to remain healthy.
Extended lens wearers may have an increased risk for corneal infections and corneal ulcers, primarily due to poor care and cleaning of the lenses, tear film instability, and bacterial stagnation. Corneal neovascularization has historically also been a common complication of extended lens wear, though this does not appear to be a problem with silicone hydrogel extended wear. The most common complication of extended lens use is conjunctivitis, usually allergic or giant papillary conjunctivitis (GPC), sometimes associated with a poorly fitting contact lens.
By frequency of replacement
The various soft contact lenses available are often categorized by their replacement schedule. The shortest replacement schedule is single use (daily disposable) lenses, which are disposed of each night. These may be best for patients with ocular allergies or other conditions, because it limits deposits of antigens and protein. Single use lenses are also useful for people who use contacts infrequently, or for purposes (e.g. swimming or other sporting activities) where losing a lens is likely. More commonly, contact lenses are prescribed to be disposed of on a two-week or monthly basis. Quarterly or annual lenses, which used to be very common, have lost favor because a more frequent disposal schedule allows for thinner lenses and limits deposits. Rigid gas permeable lenses are very durable and may last for several years without the need for replacement. PMMA hard lenses were very durable, and were commonly worn for 5 to 10 years.
By design
A spherical contact lens is one in which both the inner and outer optical surfaces are portions of a sphere. A toric lens is one in which either or both of the optical surfaces have the effect of a cylindrical lens, usually in combination with the effect of a spherical lens. Myopic (nearsighted) and hypermetropic (farsighted) people who also have astigmatism and who have been told they are not suitable for regular contact lenses may be able to use toric lenses. If one eye has astigmatism and the other does not, the patient may be told to use a spherical lens in one eye and a toric lens in the other. Toric lenses are made from the same materials as regular contact lenses but have a few extra characteristics:
They correct for both spherical and cylindrical aberration.
They may have a specific 'top' and 'bottom', as they are not symmetrical around their centre and must not be rotated. Lenses must be designed to maintain their orientation regardless of eye movement. Often lenses are thicker at the bottom and this thicker zone is pushed down by the upper eyelid during blinking to allow the lens to rotate into the correct position (with this thicker zone at the 6 o'clock position on the eye). Toric lenses are usually marked with tiny striations to assist their fitting.
They are usually more expensive to produce than non-toric lenses; therefore they are usually meant for extended wear. The first disposable toric lenses were introduced in 2000 by Vistakon.
Like eyeglasses, contact lenses can have one (single vision) or more (multifocal) focal points.
For correction of presbyopia or accommodative insufficiency multifocal contact lenses are almost always used; however, single vision lenses may also be used in a process known as monovision[32]: single vision lenses are used to correct one eye's far vision and the other eye's near vision. Alternatively, a person may wear single vision contact lenses to improve distance vision and reading glasses to improve near vision.
Rigid gas permeable bifocal contact lenses most commonly have a small lens on the bottom for the near correction, when the eyes are lowered to read, this lens comes into the optical path. RGPs must translate (move vertically) to work properly, and thus the gaze of the eye can change from the near to the distant sections, much like bifocal eyeglasses.
Multifocal soft contact lenses are more complex to manufacture and require more skill to fit. All soft bifocal contact lenses are considered "simultaneous vision" because both far and near vision corrections are presented simultaneously to the retina, regardless of the position of the eye. Of course, only one correction is correct, the incorrect correction causes blur. Commonly these are designed with distance correction in the center of the lens and near correction in the periphery, or vice versa.
Contact lenses are classified in many different manners.
By function
Corrective contact lenses
A corrective contact lens is a lens designed to improve vision. In many people, there is a mismatch between the refractive power of the eye and the length of the eye, leading to a refraction error. A contact lens neutralizes this mismatch and allows for correct focusing of light onto the retina. Conditions correctable with contact lenses include near (or short) sightedness (myopia), far (or long) sightedness (hypermetropia), astigmatism and presbyopia. Contact wearers must usually take their contacts out every night or every few days, depending on the brand and style of the contact. Recently there has been renewed interest in orthokeratology, the correction of myopia by deliberate overnight flattening of the cornea, leaving the eye without contact lens or eyeglasses correction during the day.
For those with certain color deficiencies, a red-tinted "X-Chrom" contact lens may be used. Although the lens does not restore normal color vision, it allows some colorblind individuals to distinguish colors better
ChromaGen lenses have been used and these have been shown to have some limitations with vision at night although otherwise producing significant improvements in colour vision.An earlier study showed very significant improvements in colour vision and patient satisfaction
Later work that used these ChromaGen lenses with dyslexics in a randomised, double-blind, placebo controlled trial showed highly significant improvements in reading ability over reading without the lenses This system has been granted FDA approval in the United States, which is reassuring to patients.
Cosmetic contact lenses
A cosmetic contact lens is designed to change the appearance of the eye. These lenses may also correct the vision, but some blurring or obstruction of vision may occur as a result of the color or design. In the United States, the FDA frequently calls non-corrective cosmetic contact lenses decorative contact lenses.
Theatrical contact lenses are a type of cosmetic contact lens that are used primarily in the entertainment industry to make the eye appear pleasing, unusual or unnatural in appearance, most often in horror and zombie movies, where lenses can make one's eyes appear demonic, cloudy and lifeless, or even to make the pupils of the wearer appear dilated to simulate the natural appearance of the pupils under the influence of various illicit drugs.
Scleral lenses cover the white part of the eye (i.e. sclera) and are used in many theatrical lenses..Due to their size, these lenses are difficult to insert and do not move very well within the eye. They may also hamper the vision as the lens has a small area for the user to see through. As a result they generally cannot be worn for more than 3 hours as they can cause temporary vision disturbances.
Similar lenses have more direct medical applications. For example, some lenses can give the iris an enlarged appearance, or mask defects such as absence (aniridia) or damage (dyscoria) to the iris.
Although many brands of contact lenses are lightly tinted to make them easier to handle, cosmetic lenses worn to change the color of the eye are far less common, accounting for only 3% of contact lens fits in 2004.
Therapeutic contact lenses
Soft lenses are often used in the treatment and management of non-refractive disorders of the eye. A bandage contact lens protects an injured or diseased cornea from the constant rubbing of blinking eyelids thereby allowing it to heal.They are used in the treatment of conditions including bullous keratopathy, dry eyes, corneal ulcers and erosion, keratitis, corneal edema, descemetocele, corneal ectasis, Mooren's ulcer, anterior corneal dystrophy, and neurotrophic keratoconjunctivitis. Contact lenses that deliver drugs to the eye have also been developed.
By constructional material
Contact lenses, other than the cosmetic variety, become almost invisible once inserted in the eyeThe first contact lenses were made of glass, which caused eye irritation, and were not wearable for extended periods of time. But when William Feinbloom introduced lenses made from polymethyl methacrylate (PMMA or Perspex/Plexiglas), contacts became much more convenient. These PMMA lenses are commonly referred to as "hard" lenses (this term is not used for other types of contacts).
However, PMMA lenses have their own side effects: no oxygen is transmitted through the lens to the cornea, which can cause a number of adverse clinical events. In the late 1970s, and through the 1980s and 1990s, improved rigid materials — which were also oxygen-permeable — were developed. Collectively, these polymers are referred to as rigid gas permeable or 'RGP' materials or lenses. One advantage of hard lenses is that, due to their non-porous nature, they do not absorb chemicals or fumes. The absorption of such compounds by other types of contacts can be a problem for those who are routinely exposed to painting or other chemical processes.
Rigid lenses offer a number of unique properties. In effect, the lens is able to replace the natural shape of the cornea with a new refracting surface. This means that a regular (spherical) rigid contact lens can provide good level of vision in people who have astigmatism or distorted corneal shapes as with keratoconus.
While rigid lenses have been around for about 120 years, soft lenses are a much more recent development. The principal breakthrough in soft lenses made by Otto Wichterle led to the launch of the first soft (hydrogel) lenses in some countries in the 1960s and the approval of the 'Soflens' material (polymacon) by the United States FDA in 1971. Soft lenses are immediately comfortable, while rigid lenses require a period of adaptation before full comfort is achieved. The polymers from which soft lenses are manufactured improved over the next 25 years, primarily in terms of increasing the oxygen permeability by varying the ingredients making up the polymers.
A small number of hybrid rigid/soft lenses exist. An alternative technique is piggybacking of contact lenses, a smaller, rigid lens being mounted atop a larger, soft lens. This is done for a variety of clinical situations where a single lens will not provide the optical power, fitting characteristics, or comfort required.
In 1999, 'silicone hydrogels' became available. Silicone hydrogels have both the extremely high oxygen permeability of silicone and the comfort and clinical performance of the conventional hydrogels. These lenses were initially advocated primarily for extended (overnight) wear, although more recently daily (no overnight) wear silicone hydrogels have been launched.
While it provides the oxygen permeability, the silicone also makes the lens surface highly hydrophobic and less "wettable." This frequently results in discomfort and dryness during lens wear. In order to compensate for the hydrophobicity, hydrogels are added (hence the name "silicone hydrogels") to make the lenses more hydrophilic. However the lens surface may still remain hydrophobic. Hence some of the lenses undergo surface modification processes which cover the hydrophobic sites of silicone. Some other lens types incorporate internal rewetting agents to make the lens surface hydrophilic.
By wear time
A daily wear contact lens is designed to be removed prior to sleeping. An extended wear (EW) contact lens is designed for continuous overnight wear, typically for 6 or more consecutive nights. Newer materials, such as silicone hydrogels, allow for even longer wear periods of up to 30 consecutive nights; these longer-wear lenses are often referred to as continuous wear (CW). Generally, extended wear lenses are discarded after the specified length of time. These are increasing in popularity, due to their obvious convenience. Extended- and continuous-wear contact lenses can be worn for such long periods of time because of their high oxygen permeability (typically 5-6 times greater than conventional soft lenses), which allows the eye to remain healthy.
Extended lens wearers may have an increased risk for corneal infections and corneal ulcers, primarily due to poor care and cleaning of the lenses, tear film instability, and bacterial stagnation. Corneal neovascularization has historically also been a common complication of extended lens wear, though this does not appear to be a problem with silicone hydrogel extended wear. The most common complication of extended lens use is conjunctivitis, usually allergic or giant papillary conjunctivitis (GPC), sometimes associated with a poorly fitting contact lens.
By frequency of replacement
The various soft contact lenses available are often categorized by their replacement schedule. The shortest replacement schedule is single use (daily disposable) lenses, which are disposed of each night. These may be best for patients with ocular allergies or other conditions, because it limits deposits of antigens and protein. Single use lenses are also useful for people who use contacts infrequently, or for purposes (e.g. swimming or other sporting activities) where losing a lens is likely. More commonly, contact lenses are prescribed to be disposed of on a two-week or monthly basis. Quarterly or annual lenses, which used to be very common, have lost favor because a more frequent disposal schedule allows for thinner lenses and limits deposits. Rigid gas permeable lenses are very durable and may last for several years without the need for replacement. PMMA hard lenses were very durable, and were commonly worn for 5 to 10 years.
By design
A spherical contact lens is one in which both the inner and outer optical surfaces are portions of a sphere. A toric lens is one in which either or both of the optical surfaces have the effect of a cylindrical lens, usually in combination with the effect of a spherical lens. Myopic (nearsighted) and hypermetropic (farsighted) people who also have astigmatism and who have been told they are not suitable for regular contact lenses may be able to use toric lenses. If one eye has astigmatism and the other does not, the patient may be told to use a spherical lens in one eye and a toric lens in the other. Toric lenses are made from the same materials as regular contact lenses but have a few extra characteristics:
They correct for both spherical and cylindrical aberration.
They may have a specific 'top' and 'bottom', as they are not symmetrical around their centre and must not be rotated. Lenses must be designed to maintain their orientation regardless of eye movement. Often lenses are thicker at the bottom and this thicker zone is pushed down by the upper eyelid during blinking to allow the lens to rotate into the correct position (with this thicker zone at the 6 o'clock position on the eye). Toric lenses are usually marked with tiny striations to assist their fitting.
They are usually more expensive to produce than non-toric lenses; therefore they are usually meant for extended wear. The first disposable toric lenses were introduced in 2000 by Vistakon.
Like eyeglasses, contact lenses can have one (single vision) or more (multifocal) focal points.
For correction of presbyopia or accommodative insufficiency multifocal contact lenses are almost always used; however, single vision lenses may also be used in a process known as monovision[32]: single vision lenses are used to correct one eye's far vision and the other eye's near vision. Alternatively, a person may wear single vision contact lenses to improve distance vision and reading glasses to improve near vision.
Rigid gas permeable bifocal contact lenses most commonly have a small lens on the bottom for the near correction, when the eyes are lowered to read, this lens comes into the optical path. RGPs must translate (move vertically) to work properly, and thus the gaze of the eye can change from the near to the distant sections, much like bifocal eyeglasses.
Multifocal soft contact lenses are more complex to manufacture and require more skill to fit. All soft bifocal contact lenses are considered "simultaneous vision" because both far and near vision corrections are presented simultaneously to the retina, regardless of the position of the eye. Of course, only one correction is correct, the incorrect correction causes blur. Commonly these are designed with distance correction in the center of the lens and near correction in the periphery, or vice versa.
Protect Your Eyes,Wear Sunglasses Please!
Protect Your Eyes,Wear Sunglasses Please!
Do you wear sunglasses outside?Whether you do or not,sunglasses are important to the heralth of your eyes.There are many shapes, colors,and lens designs of sunglasses.And it would be difficult for you to pick one that is right for you for each person is so different.As a professional Optician,i would like to guide you.
How to choose frames?
Sunglasses frames today vary from wraps to Jackie Os.Metals, plastics and maybe many others. When choosing frames you must remember this, choose a frame that is slightly larger, with placement close to the face. This will help prevent light from streaming into the eye. The best example may be a wrap frame. Many manufactures including Nike and Carrera make them right now. The only disadvantage is that it is difficult to put a prescription in them due to the extreme wrap of the frame. It's too flat for most prescription lenses to successfully stay in a frame to give you clear vision. Right now,new trends in frames include a lot of embellishments including rhinestones and inlays. It's examples are the Christian Dior Monday and the Via Spiga 402-s. Another new strongley trend is the drilled mounted shields. Ralph Lauren, Giorgio Armani and Kate Spade all provide excellent choices for you both for non prescription and prescription.
How to choose lenses?
Lenses also are of various designs. And the most rocommended for sun wear is polarized. Because it can removes all reflective glare. So boaters and fishermen usually wear them to see clearer into the water, and now it is recommend for everyone. There are many colors including the neutralizing even transmission gray, the contrasting brown and the popular g-15 Rayban color. It also comes in all types of prescriptions including sv, bifocals, trifocals and popular Varilux Progressives.You wouldn't need to matter the it's thickness either because they may come in all types of materials including polycarbonate,hi index,plastic and so on.
Other Choices
Other choices there are too. There are photo chromic lenses. These lenses change color with the uv rays from the sun. They are 100% uv protective, come in gray and brown.When an Anti-reflective coating is added, the lenses are perfectly clear indoors and sunglass darkness in direct sunlight.. There is one disadventage also, the lenses do not change color in a car. Because the ultraviolet rays needed to change the lenses will be absorbed by windshields of cars
If you do not care about what is talked above.You could also just choose the traditional sunglasses.With a dark lens in either gray (the number one choice), brown, or any other fashion tint under the sun.The trendiest colors right now are cooper, coral, mint green and aqua. Keep in mind these are not true sun lenses. If they are tinted to dark, they can effect driving and effect contrast. Standard tint should allow between 8% and 30% transmission of light to the eye.You must remember that each pair of sunglasses should be 100% UVA and UVB protective.And you shuoldn't go by the stickers or designer name.Do make a cheak of them and have your taste!
Do you wear sunglasses outside?Whether you do or not,sunglasses are important to the heralth of your eyes.There are many shapes, colors,and lens designs of sunglasses.And it would be difficult for you to pick one that is right for you for each person is so different.As a professional Optician,i would like to guide you.
How to choose frames?
Sunglasses frames today vary from wraps to Jackie Os.Metals, plastics and maybe many others. When choosing frames you must remember this, choose a frame that is slightly larger, with placement close to the face. This will help prevent light from streaming into the eye. The best example may be a wrap frame. Many manufactures including Nike and Carrera make them right now. The only disadvantage is that it is difficult to put a prescription in them due to the extreme wrap of the frame. It's too flat for most prescription lenses to successfully stay in a frame to give you clear vision. Right now,new trends in frames include a lot of embellishments including rhinestones and inlays. It's examples are the Christian Dior Monday and the Via Spiga 402-s. Another new strongley trend is the drilled mounted shields. Ralph Lauren, Giorgio Armani and Kate Spade all provide excellent choices for you both for non prescription and prescription.
How to choose lenses?
Lenses also are of various designs. And the most rocommended for sun wear is polarized. Because it can removes all reflective glare. So boaters and fishermen usually wear them to see clearer into the water, and now it is recommend for everyone. There are many colors including the neutralizing even transmission gray, the contrasting brown and the popular g-15 Rayban color. It also comes in all types of prescriptions including sv, bifocals, trifocals and popular Varilux Progressives.You wouldn't need to matter the it's thickness either because they may come in all types of materials including polycarbonate,hi index,plastic and so on.
Other Choices
Other choices there are too. There are photo chromic lenses. These lenses change color with the uv rays from the sun. They are 100% uv protective, come in gray and brown.When an Anti-reflective coating is added, the lenses are perfectly clear indoors and sunglass darkness in direct sunlight.. There is one disadventage also, the lenses do not change color in a car. Because the ultraviolet rays needed to change the lenses will be absorbed by windshields of cars
If you do not care about what is talked above.You could also just choose the traditional sunglasses.With a dark lens in either gray (the number one choice), brown, or any other fashion tint under the sun.The trendiest colors right now are cooper, coral, mint green and aqua. Keep in mind these are not true sun lenses. If they are tinted to dark, they can effect driving and effect contrast. Standard tint should allow between 8% and 30% transmission of light to the eye.You must remember that each pair of sunglasses should be 100% UVA and UVB protective.And you shuoldn't go by the stickers or designer name.Do make a cheak of them and have your taste!
Fashion of eyeglasses
Fashion of eyeglasses
Glasses can be a major part of personal expression, from the extravagance of Elton John and Dame Edna Everage, to Groucho Marx and Buddy Holly.
For some celebrities, glasses form part of their identity. American Senator Barry Goldwater continued to wear lensless horn-rimmed spectacles after being fitted with contact lenses because he was not recognizable without his trademark glasses. British soap star Anne Kirkbride had the same problem: her character on Coronation Street, Deirdre Barlow, became so well-known for her big frames that she was expected to wear them at social gatherings and in international tours, even though Kirkbride has always worn contact lenses. Drew Carey continued to wear glasses for the same reason after getting corrective laser eye surgery. British comedic actor Eric Sykes, who became profoundly deaf as an adult, wears glasses that contain no lenses; they are actually a bone-conducting hearing aid. Masaharu Morimoto wears glasses to separate his professional persona as a chef from his stage persona as Iron Chef Japanese. John Lennon wore his round-lens 'Windsor' spectacles from some of his time with the Beatles to his murder in 1980. The rock band Weezer is known for some of the members wearing thick-rimmed glasses.
In popular culture, glasses were all the disguise Superman and Wonder Woman needed to hide in plain view as alter egos Clark Kent and Diana Prince, respectively. An example of halo effect is seen in the stereotype that those who wear glasses are intelligent or, especially in teen culture, even geeks and nerds. Some people who find that wearing glasses may look nerdy turn to contact lenses or laser eye surgery, especially under peer pressure.
Another unpopular aspect of glasses is their inconvenience. Even through the creation of light frames, such as those made of titanium, very flexible frames, and new lens materials and optical coatings, glasses can still cause problems during rigorous sports. The lenses can become greasy or trap vapour when eating hot food, swimming, walking in rain or rapid temperature changes (such as walking into a warm building from cold temperatures outside), reducing visibility significantly. Scraping, fracturing, or breakage of the lenses require time-consuming and costly professional repair, though modern plastic lenses are almost indestructible and very scratch-resistant.
Apple, Inc. co-founder Steve Wozniak had a pair of eyeglasses made with lenses in the shape of the well-known Apple logo. The lenses were made from a block of acrylic, laminated from layers in the usual rainbow colors, and machined into the appropriate outline, with a custom-made frame in the same shape. They were made by a Silicon Valley optician.
buy glasses online: glassesshop.com
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