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the water carries dissolved oxygen lenses through these lenses to the eye surface, says an optometrist and head of clinical affairs at ciba vision. "the eye needs oxygen to keep the tissue healthy." a high water content discount and contact also makes soft lenses more comfortable. people blink about every 5 seconds, and a wet lens surface reduces the friction between the eyelid and the plastic. for 20 years, most of the innovations in soft lenses boosted the hydrogel''s water content. this approach has its limits, though. too much water makes the lens fragile and difficult to handle. contact lens wearers become frustrated trying to slide a floppy lens from a fingertip to an eye. moreover, even if a lens could be made of a layer of pure water, it wouldn''t get enough oxygen lenses and discount to the eye. researchers decided to find new polymers that could allow greater oxygen flow.

the water carries dissolved oxygen lenses through these lenses to the eye surface, says an optometrist and head of clinical affairs at ciba vision. "the eye needs oxygen to keep the tissue healthy." a high water content discount and contact also makes soft lenses more comfortable. people blink about every 5 seconds, and a wet lens surface reduces the friction between the eyelid and the plastic. for 20 years, most of the innovations in soft lenses boosted the hydrogel''s water content. this approach has its limits, though. too much water makes the lens fragile and difficult to handle. contact lens wearers become frustrated trying to slide a floppy lens from a fingertip to an eye. moreover, even if a lens could be made of a layer of pure water, it wouldn''t get enough oxygen lenses and discount to the eye. researchers decided to find new polymers that could allow greater oxygen flow.

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 contact area of the cornea under the lens. imagine sticking your glasses directly to your eyeballs--clear vision lenses but discomfort and awkwardness. discount bausch and lomb introduced the first soft contact lens. this development signaled "a revolution in contact comfort to the patient," says a materials scientist at the university. soft contacts lenses rely on plastics called hydrogels, polymers that soak up a lot of water. the first hydrogel discount used for contacts was contact hydroxyethyl methacrylate, or hema. lenses of this material can hold 38 to 70 percent water by weight, which makes the lens soft and flexible.

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