Eyeglasses Shoppin Guide

Types of contact lenses: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 eye glasses, 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 and titanium eyeglasses 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.
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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.

Types of contact lenses:By constructional material

Contact lenses,other than eyeglasses and the cosmetic variety, become almost invisible once inserted in the eyeThe first contact lenses were made of glass such as rimless eyeglasses, flexible eyeglasses and 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.

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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.

Types of contact lenses: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 in cheap eyeglasses 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 than other glasses like plastic frames 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 not in metal frames 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 in discount eyeglasses ; therefore they are usually meant for extended wear. The first disposable toric lenses were introduced in 2000 by Vistakon.
Like eyeglasses, contact lenses and sunglasses online 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.

Types of contact lenses:By frequency of replacement

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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 used in reading eyeglasses of titanium frames or metal frames , 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.

What should be considered when you choose contact lenses?

When you are choosing contact lenses, not eyeglass frames , optical eyeglasses , many factors should be considered including your lifestyle,health,astigmatism,corneal curvature,allergies,dry eyes,hygiene,previous over-wear,frequency of use and so on.Seeing your Optometrist will help you determine the best type of contact lenses for your eyes.

1. A Good Eye Health?
Before you decide to wear contact lenses, not classic eyeglasses or bifocal eyeglasses , you should cheak for your eye health.You can wear only if you have a good health.The healthiest type of lens is the daily disposable soft lens. These lenses are always sterile when inserted into the eyes as they are never kept overnight. This means that no dirt, bugs or tear proteins can accumulate which all have the potential to cause problems. Fortnightly and Monthly disposables are also available which still require daily cleaning and overnight storage with contact lens solutions.

2. Have Astigmatism?
Normally,your eye is shape like a tennis ball.But with astigmatism,your eye is not perfectly round like a tennis ball.At a certain level of astigmatism the contact lens prescription needs to be “tailor-made” in order for you to see clearly. Lenses that cater to astigmatism are called Torics and are available in both rigid and soft form.
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It is often possible to fit a normal rigid contact lens and correct the problem without the need for a Toric with lower levels of astigmatism.If you have mainly short or long-sight with very little astigmatism, a normal soft contact lens is generally fine for you just.

3.What are lifestyle?
Your lifestyle often determines your the requirements of sight correction, which in turn influences the type of contact lens suitable.And if you may work in an office and use the computer all day, for which you wear spectacles; perhaps you play golf, or football once per week and find that your spectacles “steam up”?A limited supply of daily disposables just for sport would be your best option rather than monthly disposables, which require cleaning and will not be used often enough to make them worthwhile.
If you are a rugby player and require good side vision in order to perform optimally, full-time contact lens wear is probably your wisest option.
Frequent jet-setters may prefer spectacles as contact lenses inevitably dry out whilst flying. Whatever your lifestyle, your optometrist will prescribe contact lenses tailored to your needs

4.Have Any Allergies?
Hayfever, eczema or asthma sufferers may find contact lenses more uncomfortable than most people. Allergies can create an over-sensitized eye, rendering increased lens awareness. Also, the eye reacts to dirt and proteins on the lens much more and may cause the upper eyelid to develop bumps. This is called contact lens related papillary Conjunctivitis. The best solution for those with severe allergies is to wear lenses infrequently (up to 3 times/week) and to use daily disposables. If your lifestyle requires you to use lenses constantly, then disposables are still the best option. Occasionally some individuals are allergic to a certain lens material or a certain lens solution.

5.With Dry Eyes?
If you suffer from chronic dry, smarting eyes. It may cause increased lens awareness after some hours of lens wear. Your optometrist will prescribe an alternative lens with a different water content, fitting or material, in order to improve the comfort. Preservative-free contact lens comfort drops are also advised.

6.Your Frequency Of Use.
Are you only wish to use contact lenses for a sporting activity once per week? If you are,a daily disposable will be most suitable from both a health and cost perspective. Rigid lenses are not recommended as they need to be used most days in order to achieve best comfort. Those who wear their lenses sporadically may wish to consider fortnightly or monthly disposables. Your optometrist will be able to discuss the various options most suited to your requirements.

7.Your Previous Over-wear
If you have previously over-worn your contact lenses, your eyes will need more oxygen.So you may be told to use a higher water content, or higher Dk, lens.Because it may be a soft or rigid lens. Remember to give your eyes a break and use your spectacles one day per week.Just remember.

8.Other factors
Such as corneal curvature,hygiene and so on to be considered.

What are contact lenses?

A contact lens (also known simply as a “contact”) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle, who also invented the first gel used for their production

Contact lenses is also a kind of optical glasses with special glasses lens usually serve the same corrective purpose as conventional glasses like prescription sunglasses but are lightweight and virtually invisible—many commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage solutions.

Some cosmetic lenses are deliberately colored to alter the appearance of the eye.It has been estimated that 125 million people use contact lenses worldwide (2%),including 28 to 38 million in the United States and 13 million in Japan.The types of lenses used and prescribed vary markedly between countries, with rigid lenses accounting for over 20% of currently-prescribed lenses in Japan, Netherlands and Germany but less than 5% in Scandinavia. People choose to wear contact lenses for various reasons. Buy discount eyeglasses , cheap eyeglasses online.

Many consider their appearance to be more attractive with contact lenses than with glasses. Contact lenses are less affected by wet weather, do not steam up, and provide a wider field of vision. They are more suitable for a number of sporting activities.

Additionally, ophthalmological conditions such as keratoconus and aniseikonia may not be accurately corrected with glasses.

Aspheric Eyeglasses Lenses

It should be well known that the aspheric prescription lenses is important for optometrists to provide better vision to their patients.Althrough aspheric eyeglass lenses are thinner and of less weight,provide better off axis performance. Because through a wider portion of the lens,Aspheric eyeglass lenses alloers increased visual acuity.

An aspheric eyeglass lenses is just a kind of lens when eyeglasses sale varying slightly from a fine,spherical shape.But why is it important to an optician when designing a lens?When designing a lens an optician has to deal with a few aberrations to design a lens that improves the patient’s sight.These aberrations include spherical aberration, coma, radial astigmatism, curvature of field, and distortion.These five aberrations collectively are just known as Seidel Aberrations described by Ludwig Von Seidel in the 1850’s.Why aspheric eyeglass lenses not rimless glasses or flexible glasses can correct the spherical aberration.

Here is an example:It can be shown in the picture that when the eye is looking straight ahead the ray has a shorter distance to focus than if the eye was rotated to look through the periphery of the lens.When we buy discount eyeglasses , We must account for this change in vertex distance,or distance between the lens and eye,otherwise we will be out of focus when viewing objects through the periphery.And the change in curvature can be used by aspheric eyeglass lenses to accommodate for the change in distance.And with the designed optical eyewear aspheric eyeglass lenses,the patient can have much improved sight through the periphery of the lens right now.

This is just why designed aspheric eyeglass lenses became more and more popular in our daily prescription eyeglass wear.

Abbreviations and Terms

Introduce:
An eyeglass prescription is a written order by an optometrist or ophthalmologist to an optician for eyeglasses such as reading glasses , optical frames It specifies the refractive power to which the eyeglasses are to be made in order to correct blurred vision due to refractive errors, including myopia, hyperopia, astigmatism, and presbyopia. It is typically determined using a phoropter or an automated refractor.

Abbreviations and terms:
Similar to medical prescriptions, eyeglass prescriptions of titanium glasses , metal glasses , plastic glasses are written on paper pads that frequently contain a number of different abbreviations and terms:

* D.V. is an abbreviation for “distance vision”. This specifies the part of the prescription designed primarily to improve far vision. In a bifocal lens, this generally indicates what is to be placed in the top segment.
* N.V. is an abbreviation for “near vision”. This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens. Some cheap eyeglasses prescription forms use “ADD” in place of “N.V.” with a single box to indicate the additional refractive power to be added to the spherical of each eye.
* O.D. is an abbreviation for oculus dexter, Latin for “right eye.” (Some eyeglass prescriptions simply say “left” and “right” instead of “O.S.” and “O.D.”) Oculus means “eye” (as in “oculist,” an old term for an eye doctor).

* O.S. is an abbreviation for oculus sinister, Latin for “left eye”.
* O.U. is an abbreviation for oculi uterque, Latin for “both eyes”.
* A spherical correction corrects the refractive error of the eye by adding or subtracting refractive strength symmetrically, by the same amount, along the horizontal and vertical axis.
* A cylindrical correction corrects the astigmatic refractive error of the eye by adding or subtracting strength along the horizontal axis, the vertical axis, or a diagonal axis.
* The Axis is the horizontal, vertical or diagonal angle of the cylindrical correction. The axis is measured in a clock face that starts with zero degrees in the 9 o’clock (or west) direction, and increases through 90 and 180 degrees in a counter-clockwise direction.
Most eyeglass prescriptions will contain values here. The “spherical” and “cylindrical” columns contain lens strengths in diopters (see below); “axis” contains the direction of the cylinder axis in degrees.

* Prism and Base are usually left empty, as they are not seen in most prescriptions. Prism refers to a displacement of the image through the lens, and is used to treat muscular imbalance or other conditions (see vergence dysfunction) that cause errors in eye orientation. Prism correction is measured in “prism diopters”, and Base refers to the direction of displacement.
* PD is the distance between pupils, or Pupillary Distance, usually given in millimeters, and written as two values if the prescription is for bifocals or progressive lenses - these are the pupillary distances for the upper and lower lens. They differ due to pupillary convergence when looking at nearby objects.

Background

Blur is the subjective experience or perception of a defocus aberration within the Eyeglasses. Blur may appear differently depending on the amount and type of refractive error.

The following are some examples of blurred images that may result from refractive errors:
Blur is corrected by focusing light on the retina. This may be done with eye glasses , rimless eyeglasses , lexible eyeglasses or contact lenses, or by altering the shape of various eye structures via refractive surgery or special contact lenses.Eyeglasses sometimes have unwanted effects including magnification or reduction, distortion, color fringes, altered depth perception, etc. You can buy discount eyeglasses , cheap eyeglasses online

Although many people think of lenses as magnifiers, the lenses within eyeglasses improve vision primarily by reducing blur. Depending on the optical setup, they may also produce magnfication or reduction of images which may or may not be intentional or desirable.

Why Sunglasses Are Effective
Article Source: ezinearticles.com

All your life you have heard about the importance of eyeglasses. You are probably aware that they are used to protect your eyes, blocking them from sunlight and preserving your vision. But do you know how sunglasses actually do all that? Apart from complementing your look, they work in four different ways. You should learn what these are and make sure that your sunglasses are actually doing the work they are meant to.

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Ultraviolet rays are present in sunlight and these can cause damage the corneas. Sunglasses help give your eyes protection from the dangerous UV rays, and good ones give your eyes 100% protection. A coating is put outside the lenses of the sunglasses which acts as a UV filter. It allows light to pass through, so you can see, but blocks out the UV light which can harm your eyes.

The most common reason people wear sunglasses is to get protection from the glare of sunlight. Powerful sunlight can make you close your eyes or narrow them, thus causing a squint. This is a natural reaction which protects the corneas. It is not just bright sunlight which can cause damage, but also glare from the snow, because snow reflects the sunlight highly intensified and magnified, so it can be even more dangerous.

Sunglasses are tinted according to your requirements, based on how much light protection is needed. Just as there are different types of light, the various shades of the lenses of sunglasses also protect your eyes in their differing ways. Among the good lens colors are gray and almost black which give the most protection from powerful light, at the same time not distorting colors.

Of utmost importance is the fact the sunglasses safeguard your eyes from glare. The sunlight reflects off water and shiny surfaces which amplify the light and cause glare, which can be blinding if you don’t wear sunglasses and can even cause accidents. Good sunglasses shield eyes from this kind of glare.

Just as sound waves vibrate so do light waves and when a group comes together, the result is a glare. If you get blinded by glare off water or glass (like the windshield of a car), you see a combination of light waves. There are polarization filters which are used in the lenses of sunglasses which realign the waves and thus get rid of the glare.

Sunglasses can eradicate particular light frequencies which can cause vision to blur or change colors. Therefore selecting the correct color of the lenses of the sunglasses helps them protect your eyes in different conditions.

If you want to block out blue light, then you ought to be wearing sunglasses whose lenses are yellow, gold, amber or brown. Blue light is the major color which causes blurred vision. Even though yellow lenses have a tendency to distort other colors, their benefits far outweigh their disadvantages.

Similar to yellow lenses, green lenses also filter blue light and help in protecting eyes from glare. Their higher contrast features and the fact that they offer great visual sharpness also make them extremely popular. Other colored lenses are rose and purple, and they give the best contrast and protection in the green or blue background. That is why they are good for hunting and water skiing.

The History of Ray Ban Sunglasses and Eye Protection
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If you have ever seen Tom Cruise in “Risky Business”, you will remember two things. The first being the most famous scene from that movie, the one where he comes sliding into the living room dancing in his underwear, and the second, how good he looked in those sunglasses in eyeglasses stores . Cruise sported Ray Ban sunglasses in this movie and they became as big a hit as the movie itself. By the time this movie was made in 1983 however, Ray Ban had already been making popular sunglasses for 46 years.

The optical firm Bausch and Lomb launched the first Ray Ban sunglasses in 1936, which were anti-glare aviator sunglasses. They were the first to use polarized technology, which was developed by Edwin H. Land, the founder of the Polaroid Corporation. These dark glasses had large lenses, about two or three times the size of the eye socket, in the shape of an oblique teardrop. Instead of being flat, these glasses were slightly convex. The goal of these large, curved glasses was to protect the eyes from every angle for optimal protection from the sun. In the 1940’s, Ray Ban was hired by the US Air Force to develop these glasses even further for use by air force pilots. The Aviator glasses soon became popular with the other branches of the US military as well and when General Douglas MacArthur was photographed landing on a beach in the Philippines during World War II, he was wearing a pair of Ray Bans.

Ray Ban has relied on photographs of celebrities to promote their eyewear throughout the years. The Blues Brothers, Miami Vice’s Don Johnson, Michael Jackson, and Madonna are just a few of the people who join Tom Cruise as Ray Ban wearers and promoters. Ray Ban Aviators have remained in style for decades but this company also moved with the times in terms of its other models. There were bright, colorful frames used in designer prescription glasses and designer spectacles to reflect the style of the 60’s, big flashy shades in the 70’s, and sportier designs of the 80’s.

From the beginning, Ray Ban sunglasses have been at the forefront of eye protection technology. These glasses stay in style not only because of their celebrity appeal but also because they are well made and practical.

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Ralph Lauren Eyewear(Sunglasses)
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Ralph Lauren is an American fashion designer from eyeglasses market and business executive, well known for his Polo Ralph Lauren clothing brand and is recognized for excellence. But in recent times it has become a range in lot of other luxuary and high end item including perfumes, handbags, sunglasses and even clothing. Ralph Lauren Sunglasses and Eyewear is famous for its sophisticated and timeless style, its oversized square frames, modern RL logo in silver on the temples, lightweight plastic lenses with 100% UV protection. However, finding the most genuine and original Ralph Lauren Sunglasses among the several replicas or fakes available today is a daunting task. But to overcome this problem you can take help from the several online shopping sites which offer you the most authentic Ralph Lauren Sunglasses and Eyewears with the finest quality lenses at the most affordable prices. Most of these virtual stores offer fair, discounted prices directly to the consumer, with great savings on prescription eyewear and many designer sunglass lines.

These online shopping sites to buy eyeglasses online functions as eyeglasses stores and offer you a large selection of Ralph Lauren Sunglasses with different styles to match any attitude or desire or even transform your style statement. You can find Ralph Lauren Sunglasses in a variety of colors like black, light tortoise, dark tortoise, etc. and different types of styles, including unisex lines, sports and aviator models, with a chic look, cutting edge style, or a classy frame that helps you to start getting noticed and allows you to say just what you desire to say. You can find the best Ralph Lauren Sunglasses combined with the best quality lenses created with the utmost care and highest standards and cutting-edge patented optical technology offering you the latest and the most hip frames that will make you feel and look outstanding. You can browse through a number Ralph Lauren Sunglasses for every season and every occasion, with the finest designs, including bold and flashy or sophisticated and timeless. You can browse through the newest Ralph Lauren Sunglasses, to the most famous old fashioned models at these stores.

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Many of these online stores offers you free shipping delivered at your doorstep, at unbeatable discount prices possible. With your online purchase of Ralph Lauren sunglasses, you can also get Unconditional Return Policy, which means, in case you are not satisfied with your purchase, you can return it at no extra cost. Further, every model comes with certificate of authenticity, native hard case and original lenses micro-cleaning cloth. They also have 24/7 customer service staffed with optical professionals, who are always ready to help you with any queries or issues you may have. Many of these online stores also carry Virtual Try-on Mirror to help you choose exactly the right frames that allows you to gauge how your frames will look on you before purchasing, thus enabling you to have a good time shopping online, relax and explore through most recent trends in eyewear. They also offer you other significant details such as logo customization, metal mesh in many more explosive colors.

Change how the World Sees Just With The Perfect Pair of Eyeglasses
Article Source: http://EzineArticles.com

I don’t know about you, but I can never find a pair of eye glasses frames that fit my face while looking fashionable at the same time. I almost dread going shopping for them when the time comes. For many people like myself, how a pair of eyeglasses look on our face is the single most important aspect of finding the perfect pair of eyeglass frames. The only thing you need to do to make sure you pick out the perfect eyewear is to simply find one that suits the shape of your face.

Eyeglasses are more than just means to an end. They do far more than just helping you see the world, as they are important fashion statements with huge effect on your appearance. If you’ve ever had the misfortune of buying glasses that just don’t look right on you, these following tips can hopefully help you out for next time. After a long and frustrating process of finding the perfect glasses frame to fit your face shape, here are a few tips to help you out:

* What you want to do first off is inspect your face to see what kind of shape it is. To do this you need to pull your hair back into a ponytail if you have long hair and look at it closely in a mirror. Different face
* shapes require different frame styles. Oval faces, for example, are proportionally balanced on the top and bottom. Any frame type will work with an oval face.
* People with long, thin faces need a larger frame that gives off the impression of a wider and shorter than it really is face. buy glasses frames in round or triangular shapes. Even a wide, rectangular shape can work with this type of face. Another way to broaden a long, thin face is to wear a frame that has color around the sides of it. More people are starting to wear round frames that are made from a thin metal. This look softens the hard, angular look of a square face, of someone with wide forehead and cheeks, and an angular chin.
* Round faces are fuller and have a soft, gentle chin, wide cheeks and smaller cheekbones. For all of these mentioned reasons is why people with this type of face shouldn’t wear round frames. It will only give off the impression of a large face. You don’t want that. Instead, wear boxy or rectangular ones and go with a lighter color to make you face appear less heavy.
* If you find yourself having a heart-shaped face, then your best bet is balance with frames that are wider at the bottom and narrower at the top. This looks much better for faces with a wide forehead that angles down to a smaller chin.
* There are a good number of people with a diamond-shaped face. This means that they have a narrow forehead, wide temples and an small angular chin. Flatter these facial features with small frames that have geometric or oval shapes minimizing the horizontal distance between the temples.
* If you have any facial features, then you it is a smart decision to buy a smaller pair of frames, especially with a beard. Large frames only mask your features that you want to show off. Small heads need to stick to wearing small frames that are no wider than the widest part of your face. Never wear glasses that look like they are tight on your face and squeezing it.

What Are Prescription Eyeglasses Made Of?

Prescription eyeglasses and prescription sunglasses are manufactured in a variety of materials. The most basic is the glass lens. The glass lens is by far the best in absorbing ultraviolet light. It comes in several different colors and is, of course, scratch resistant. It is also one of the least expensive. The downfall to the glass lens is the weight of a pair of prescription eyeglasses made of glass. They are also very breakable and have to undergo a heat-treated process to ensure durability.

Another material used to manufacture prescription eyeglasses including bifocal eyeglasses , rimless glasses are the High-Index plastic lens. It also absorbs ultra violet light well. This type of lens is much lighter in weight than the glass lens; however, they are also very expensive and can be scratched very easily.

Resin Plastic is another type of material used in manufacturing the prescription eyeglass lens. They are the lightest of all lenses, but do not offer the high level of protection against ultra violet light like classic eyeglasses that the other lenses offer.

Some prescription eyeglasses are tinted with a wide variety of colors and shades. The purpose of the tint is to reduce the glare from certain situations: such as bright lights, computers television sets, etc. Another reason for the tinting of the lenses are to offer comfort to the eyes. Also, people order tints on their rimless eyewear and eyeglasses for the fashion.

Glass and most plastic lenses are coated with a UV protection coating. Ultra violet rays can cause severe damage to the eyes. It is very important to protect your eyes while out in the sun.

Another coating that is added to a pair of prescription eyeglasses is the scratch-resistant coating. Sometimes this coating is applied at the manufacturer and other times it can be added right there at the eye doctors office. It must be said, however, that even while this coating can aid in the durability of the lens, it does not make the lens scratch proof.

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Risks Of Wearing Contact Lenses
article source: www.fda.gov

Wearing contact lenses not like wearing discount eyeglasses ,puts you at risk of several serious conditions including eye infections and corneal ulcers. These conditions can develop very quickly and can be very serious. In rare cases, these conditions can cause blindness.You can not determine the seriousness of a problem that develops when you are wearing contact lenses not eyeglass lenses. You have to get help from an eye care professional to determine your problem.If you experience any symptoms of eye irritation or infection,
* remove your lenses immediately and do not put them back in your eyes.
* contact your eye care professional right way.
* don’t throw away your lenses just as eyewear frames. Store them in your case and take them to your eye care professional. He or she may want to use them to determine the cause of your symptoms.
* report serious eye problems associated with your lenses to the FDA’s MedWatch reporting program.

Symptoms of Eye Irritation or Infection
* discomfort
* excess tearing or other discharge
* unusual sensitivity to light
* itching, burning, or gritty feelings
* unusual redness
* blurred vision
* swelling
* pain

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Serious Hazards of Contact Lenses
Symptoms of eye irritation can indicate a more serious condition. Some of the possible serious hazards of wearing contact lenses are corneal ulcers and eye infections.

Corneal ulcers are open sores in the outer layer of the cornea. They are usually caused by infections. You can reduce your chances of infection if:
* you replace your contact lens storage case every 3-6 months
* you clean and disinfect your lenses properly
* you always use fresh contact lens solution and avoid non-sterile water (distilled water and tap water are not sterile and should not be used)
* you never reuse cheap eyeglasses contact lens solution
* you remove your contact lenses before swimming.

Any lenses worn overnight increase your risk of infection. Even lenses that are designed to be worn overnight (extended-wear contact lenses) increase your risk. When worn overnight, contact lenses reduce the amount of oxygen that gets to the cornea. This stresses and damages the surface of the cornea known as the epithelium. Germs can grow more rapidly in stressed corneas.

Other risks of contact lenses include
* pink eye (conjunctivitis)
* corneal abrasions
* eye irritatio

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