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typical teen curiosity has some eye doctors concerned about infections that could spread from one youngster to another when they trade cosmetic lenses. the lenses often worn to change eye color or add designs, but not necessarily to correct vision. and with this halloween sparking the highest-ever interest in novelty lenses -- the kind imprinted with images -- consumer groups are warning users about the dangers of lens swapping. fortunately, lens cases have been rare, but some have been serious. kids are unaware that these are optical devices, and they''re using them as toys. soft lenses are like sponges, and they can hold onto bacteria. doctors also warn that an ill-fitted lens can cause damage to the eye''s surface. even special if a lens does not correct vision, contact it is considered a medical device and can be sold only by prescription. wearers must have eye exams; lens lenses must be fitted properly.

typical teen curiosity has some eye doctors concerned about infections that could spread from one youngster to another when they trade cosmetic lenses. the lenses often worn to change eye color or add designs, but not necessarily to correct vision. and with this halloween sparking the highest-ever interest in novelty lenses -- the kind imprinted with images -- consumer groups are warning users about the dangers of lens swapping. fortunately, lens cases have been rare, but some have been serious. kids are unaware that these are optical devices, and they''re using them as toys. soft lenses are like sponges, and they can hold onto bacteria. doctors also warn that an ill-fitted lens can cause damage to the eye''s surface. even special if a lens does not correct vision, contact it is considered a medical device and can be sold only by prescription. wearers must have eye exams; lens lenses must be fitted properly.

modern lenses appeared on the market, says general manager of laboratories contact lens division in denver. those lenses were made from a hard plastic called polymethyl methacrylate, or pmma, that allowed no oxygen to reach the area of the cornea under the lens. imagine sticking your glasses directly to your eyeballs--clear vision but discomfort and awkwardness. bausch and lomb introduced the first soft contact lens. this development signaled "a revolution in comfort to the patient," says a materials scientist at the university. soft contacts rely on plastics called hydrogels, polymers that soak up a lot of water. the first hydrogel used for contacts was hydroxyethyl methacrylate, special or hema. lenses of this material can hold 38 to 70 percent water by weight, contact which makes the lens soft and flexible.

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