Originally, hard contact were made of a material called PMMA. Although still available, disposable the more common types of contact are listed toric below:Rigid gas-permeable (RGP) daily-wear lenses are made of plastic contact that lens does not absorb water but allows oxygen to get from the atmosphere to the cornea. (This is important because the cornea has no blood supply and needs to get its oxygen from the atmosphere through the film of tears that moves beneath the lens.) They must be removed and cleaned each night. Rigid gas-permeable (RGP) extended-wear lenses are made from plastic that also does not absorb disposable water but is more permeable to oxygen than the plastic used for daily-wear lenses.

One, he didn''t think they were available from any other source," "and two, toric he had heard they contact weren''t as highly controlled as those dispensed through doctors."Neither lens assertion is true. got on the Internet disposable and found her lenses on several Web sites for toric $35.95 for a box of six contact pairs. (Her doctor was charging $50 a box.) says her doctor told her that lenses offered by places like may have failed manufacturers'' quality checks. Bausch contacts lens and disposable and other lensmakers say there''s no difference toric in quality between contact the lenses sold through doctors and lens those sold directly to consumers. STATES CRACK DOWN. Attorneys general in 32 states have sued the American Optometric Association disposable and two of the top contact-lens manufacturers (Vistakon, a division of contacts, and Bausch), alleging that the AOA tried to get manufacturers to agree to selllenses only through optometrists or other eye-care professionals. The attorneys general say they also have evidence that doctors agreed to withhold prescriptions from toric people who sought contact to buy lenses from other sources, despite the fact that at least 22 states have laws requiring 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 has reservations lens about mail-order purchases. "The difficulty when someone goes through mail order is that they don''t come back for regular checkups," says AOA president Dr. Harvey Hanlen.

Over disposable 32 million people in the United States toric wear these small lenses that fit on top of the cornea. They provide a field of view unobstructed by lenses frames; they do not fog-up or get splattered, so it is possible to see well while walking in the rain; and they are less noticeable than any lenses style. On the other hand, they take time to get accustomed to; require more measurements for fitting; require many follow-up visits to contact the eye doctor; can lens lead to complications such as infections and corneal damage; and may not correct astigmatism as well as lenseses, especially if the astigmatism is severe.