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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 visioncorrection 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 visioncorrection 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.

Lenses should be thoroughly rinsed after cleaning visioncorrection because residual cleaning agents may lead visioncorrection to ocular irritation. visioncorrection Other methods for cleaning include spray cleaning, hydraulic cleaning and ultrasound cleaning. Soaking solutions. visioncorrection Soaking solutions are used to store hard contacts when not in use. The dry surface of a visioncorrection hard lens will not wet well, even if a wetting solution is used, until the surface layer of the lens becomes hydrated. The soaking solution maintains the lens in a constant state of hydration to provide for maximum comfort and visual acuity. It also prevents any tear film debris from drying on the lens surface and aids in removing deposits that may accumulate on the lens during wear. To maintain sterility, storage solutions contain preservatives, concentrations of which are typically higher than in wetting solutions; soaking solution should be rinsed from the lens before insertion to avoid any possible toxicity from visioncorrection the preservatives.