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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. - Check here

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Soft lenses. Soft Lenses have become the most popular among all the types of lenses. They contain hydroxyl or hydroxyl and lactam groups, which allow them to absorb and hold water. A majority of soft lenses are composed of 2-hydroxyethylmethacrylate (HE MA) with small amounts of cross-linking agents that provide a hydrogel network. The extent of cross-linking determines the hydrophilicity of the lens; any increase in the extent of cross-linking results in a decrease in availability of hydrophilic groups for interaction with water, causing the lens to be less flexible and less hydrated. Hydrophilic lenses tend to accumulate more protein deposits than hydrophobic lenses. Daily-wear contacts need to be removed before the wearer goes to sleep at night, while the extended-wear contacts may eye be worn contacts more than a day, with some having been approved for continuous use for up to a month.

The water carries dissolved oxygen 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 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 eye to handle. Contact lens wearers become frustrated trying contacts to slide a floppy lens from a fingertip to an eye. 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.

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