biomedics contact lenses: biomedics55

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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 directly to your eyeballs--clear vision but discomfort and awkwardness. Bausch and Lomb introduced the first soft contact lens. This development signaled biomedics55 "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, or HEMA. Lenses of this material can hold 38 to 70 percent water by weight, which makes the lens soft and flexible.

The cornea consumes oxygen and produces carbon dioxide at rates biomedics55 proportionate with free diffusion of gases in air. The corneal epithelium requires a minimum p02 of 15 mmHg for proper aerobic glucose metabolism. Since available atmospheric oxygen is carried in the precorneal tear film, any lens material incapable of transmitting oxygen may lead to corneal haziness and corneal necrosis. Keeping the eyes closed or wearing Lenses lowers the p02 from normal to 32 mmHg to 9 mmHg. The availability of oxygen to the cornea can be determined by monitoring the lactate concentration in the cornea. For the cornea to maintain its functional integrity, the lens must be able to slide and move over the corneal surface with each blink so as to allow oxygen permeation. This oxygenation process in hard contact lens wearers is often referred to as "tear pump phenomenon" whereby the corneal epithelium is provided with oxygen-coated tears.

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