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The primary drawback to wearing contact, especially for children, is the requirement that they be cleaned and disinfected daily in order occular to prevent an infection, which could result in permanent science damage to the eye. Careful choice of lenses and consistent lens care will minimize the risk of infection. Wearers of best lenses are the least prone to infection but the lenses are much less comfortable, more expensive, and can contact pop out of the eye more easily than lenses. Daily wear lenses put the wearer at a slightly higher risk of infection lenses and occular because they absorb more external liquids and airborne contaminants. One, he didn''t think they were available from any other source," "and two, he had heard they weren''t as highly controlled as those dispensed through doctors."Neither assertion is true. got on the science Internet and found her lenses on several Web sites for $35.95 for a box of six pairs. (Her doctor was charging $50 a box.) says her doctor told her that contact lenses offered by places like may have failed manufacturers'' lenses quality checks. Bausch occular contacts and other lensmakers say there''s no difference in quality between the lenses sold through doctors and those science sold directly to consumers. STATES CRACK DOWN. Attorneys general in 32 states have sued the American Optometric Association and two of the top contact-lens manufacturers (Vistakon, a division of contacts, and Bausch), alleging that the contact AOA tried to get manufacturers to agree to selllenses only through optometrists or other eye-care lenses and occular professionals. science The attorneys general contact say they also have evidence that doctors agreed to withhold prescriptions from people who sought to buy lenses from other sources, lenses despite the fact that occular at least 22 states have laws requiring science eye doctors to give out contact-lens prescriptions upon request.Although the AOA says patients should be able to buy their lenses anywhere, the organization contact has reservations about mail-order purchases. "The lenses difficulty when someone goes through mail order is that they don''t come back for regular checkups," says AOA president occular Dr. Harvey Hanlen. contact The concept of corrective lenses that sit directly on the eyeball was developed science in the ninth century, but it was not until the late 20th century contact that manufacturing and grinding techniques for contact lenses were perfected. occular Originally contact were made of glass, then later of hard plastic, and still later of flexible, highly oxygen-permeable soft plastic. Today, the majority of lenses worn are of two basic types: rigid gas permeable (so-called "hard" lenses) and lenses. best lenses are smaller and more durable, but require a longer period of adjustment for the wearer. Hard contact science can correct some vision problems, contact like astigmatism, that the lenses cannot. The lenses are slightly larger than best lenses. They are more comfortable and less expensive, but can be easily torn. The latest generations of contact are extended and disposable lenses. extended lenses are intended lenses to be worn for several weeks at a time, while disposable lenses are thrown away every day or every few weeks, or in the newest versions, every day.
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