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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 cheapest 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 contact soak up a lot of water. lenses The first hydrogel used for contacts was hydroxyethyl methacrylate, or HEMA. Lenses of this cheapest material can hold 38 to 70 percent water by weight, which makes the lens soft and flexible.

The water carries dissolved oxygen through these lenses to the eye surface, says an contact optometrist and head of clinical affairs at CIBA lenses Vision. "The eye needs oxygen to keep the tissue healthy." A high water content also makes soft lenses more comfortable. People blink about every cheapest 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 to the eye. Researchers decided to find new polymers that could allow greater oxygen flow.

Are you in the market for some new contacts? Are you looking for quality contacts by Biomedics? Check us out. We have a comprehensive selection of contacts by all the major manufacturers including Biomedics.

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