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Soft extended-wear lenses also bind down on the closed eye, but they are porous and allow some tears through during sleep. Because they have so little form, their binding has little effect on the shape of the eye. has approved extended-wear lenses for use up to seven days before removal for cleaning. Still, there are risks with use of extended-wear lenses, even if it''s just one night. Daily-wear lenses are removed daily for cleaning and are a safer choice, provided they aren''t worn during sleep. Another sight-threatening concern is the infection Acanthamoeba keratitis, caused by improper lens care. This difficult-to-treat parasitic infection''s symptoms are similar to those of corneal ulcers. Soft lenses are much more comfortable than rigid lenses, thanks to their ability to conform to the eye and absorb and hold water. You can get used to soft lenses within days, compared with several weeks for rigid.

Soft extended-wear lenses also bind down on the closed eye, but they are porous and allow some tears through during sleep. Because they have so little form, their binding has little effect on the shape of the eye. has approved extended-wear lenses for use up to seven days before removal for cleaning. Still, there are risks with use of extended-wear lenses, even if it''s just one night. Daily-wear lenses are removed daily for cleaning and are a safer choice, provided they aren''t worn during sleep. Another sight-threatening concern is the infection Acanthamoeba keratitis, caused by improper lens care. This difficult-to-treat parasitic infection''s symptoms are similar to those of corneal ulcers. Soft lenses are much more comfortable than rigid lenses, thanks to their ability to conform to the eye and absorb and hold water. You can get used to soft lenses within days, compared with several weeks for rigid.

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 to handle. Contact lens wearers become frustrated trying to slide a floppy lens from a fingertip to an eye. Moreover, even if a lens cosmeticcontactlenses 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 cosmeticcontactlenses greater oxygen flow.

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