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the water carries dissolved oxygen through these lenses to the eye surface, contac says an optometrist and head of clinical affairs at ciba vision. "the eye needs oxygen to keep the lenses 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 contac 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.

the water carries dissolved oxygen through these lenses to the eye surface, contac says an optometrist and head of clinical affairs at ciba vision. "the eye needs oxygen to keep the lenses 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 contac 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.

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