Astigmatism Contact Lens

Contact lens or called cornea contact glasses is a kind of optic to correct the vision or protect eyes. Not only does contact lens make improvement of the sight of myopia, hyperemia, astigmatism and other ametropia patients, but also provides wide field of vision and vivid effect. What’s more, it plays an important role in the control of youngster myopia, astigmatism and treatment of special eye diseases.

The development history of contact lens:

The idea of putting on optic directly in the eyes dates back to the year 1508.Leonardo da Vinci firstly assumed that the optical function of cornea can be taken place with a glass bottle filled up of water.

In 1636, Rene Descartes made similar proposal.

German scientist Eugen Fick succeeded in creating the first contact lens in 1887.

In 1845, an English man called Herschel discovered that pour some animal gelatin into the surface between glass and eyes to cover the cornea can correct defects of vision temporarily.

Mullen and Obring made the first pair of all-plastic-cement contact lens after the invention of material PAM in 1938.

While in 1960, scientist of Czech Republic prepared a kind of special material HEMMA. It turns soft after water absorption to comfortable, with which to manufacture the first pair of soft contact lens.

In the year 1971, Bausch Company of America produced and sold contact lens with approval of FDA firstly.

In order to improve the ability of breathe so as to achieve the goal that people can safely wear contact lens overnight, new material SMA came into being in 1974. Further improvement was made because of the participation of silicon. After that similar functional material derived, such as fluorosilicates and Fluor polymers.

Contact lens can be divided into numerous kinds in different ways. Depending on material there are soft and inflexible ones. According to wearing time, it can be divided into daily wearing and long-time wearing. While cornea contact lens for farsighted and Plano contact lens are distinguished on the base of function.

Since there are so many kinds for you to select, but never put on the contact lens without authorization. Instead you should only wear contact lens after careful examination, accurate prescription and specialized supervision and guidance from specialized medical workers.

About the Author:

I am a histoty teacher and I wear contact lens sometimes.Meanwhile,I am interested in studying the historical development of the things appearing in my daily life.

Article Source: ArticlesBase.com - Contact Lens

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Extended Wear Contact Lens

You want to always buy your contact lenses from a well-known reputable company. You can buy discount contact lenses without a prescription, but the company would be selling you a prescription device as if it were an over-the-counter device, which is in violation of FTC regulations, in other words, selling contact lenses without having a prescription from you. You'll want to take simple precautions to make any lens purchase safe and effective when you order. There are many kinds of contact lenses on the market including novelty, colored, crazy, Halloween, special effects, theatrical, costume, scary, glow in the dark, wild eyes, mirrored, black, white, and red among others. You can also get astigmatism contact lenses and bifocal contact lenses.

Once you get a contact lens prescription, it's possible to buy from stores, online, over the phone, or by mail. Contact lens sales are regulated by both the FDA (Food And Drug Administration) and the FTC (Federal Trade Commission.)

Soft lenses also come as disposable products, used once and then discarded, or as planned-replacement lenses. And rigid gas-permeable lenses tend to actually be cheaper over the life of the lens, even though they cost more, because they last longer than soft lenses. And bifocal correction is possible with both soft and rigid lenses.

Contact lenses give you excellent peripheral vision for sports, driving, safety, and performing among others. And extra-thin soft lenses are on the market for very sensitive people. Soft lenses aren't as likely as rigid lenses to pop out or get foreign material like dust underneath them.

There are also a few rigid gas-permeable lenses that are designed and approved for wearing overnight. And extended wear contact lenses are used for overnight or continuous wear, thus ranging from one to six nights or up to 30 days. The length of continuous lens wear depends on the type of lens you get and the doctor's evaluation of your tolerance for overnight wear.

With planned-replacement lenses, the eye doctor works out a replacement schedule to meet the needs of each patient. And rigid lenses generally will give you clearer vision.

Beware of attempts to substitute a different brand from the one you want when buying your contacts. Make sure to have a current, valid prescription when you do order contact lenses. There are many good contact lens suppliers now online making their lenses available at a good discount for both prescription and non-prescription lenses.

When you do place your contact lens order, make sure to request the manufacturer's patient information for your type of contact lenses. It'll give you important risk and benefit information as well as specific written instructions for use. And always ask what rebates are available to you. You have many choices today; you can buy contact lenses from an eye doctor, at an eye clinic, on the Internet, from an optical store or a warehouse club.

Whenever you do place your order make sure that your lenses are available and not out of stock, because you'll likely need them as soon as possible. Make sure to focus on the value, not just the price because most people, who are looking for the best price, are really looking for the best value.

Be aware that extended-wear rigid lenses can cause unexpected and undesirable, reshaping of the cornea. Heat disinfection is the only method that's effective against the microorganism Acanthamoeba keratitis, which is a common culprit for contact lens wearers. It also kills organisms in and on the contact lens case. To be sure your eyes remain healthy you shouldn't order lenses with a prescription that has expired or right before the prescription is about to expire. You should get re-checked by your eye doctor.

You don't want to wear lenses any longer than they're prescribed for or when you're sleeping unless you're otherwise directed to. A basic rule is to never swap your contact lenses with anyone else. Soft extended-wear lenses bind down on the eye when it's closed. But they are porous and allow some tears through during sleep and because they have so little form, their binding has very little effect on the shape of the eye.

If your first lens fitting is performed by an eye care practitioner, he or she can also help minimize or eliminate the cause of any eye irritation that is associated with the new lenses. If you're looking for cheap contact lenses, you may find that the cheap materials or other ways of cutting costs will affect the quality you want. And if you're planning to buy contact lenses, you should buy the best quality you can get, even if it's at a higher price because you don't want to skimp on the quality when it comes to your eyes.

For more information on color contact lenses and where to buy discount contact lenses visit http://www.VisionNurse.com Helen Hecker R.N.'s popular website which offers tips, advice and resources, including information on LASIK eye surgery, sunglasses, eyeglasses and affordable quality contact lenses