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Soft extended-wear lenses also bind 1800 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 contacts the shape of the eye. has approved extended-wear lenses for use up to seven days before removal for cleaning. 1800 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.

Typical cleaning solutions contain surfactants that lower surface tension, emulsify oils and aid in solubilizing other debris. Proteins and lipids are soluble in highly alkaline media, but a high pH may cause lens decomposition. Consequently, weak alkaline solutions are contacts useful in dislodging deposits 1800 from the lens when combined with the surfactants. Mild abrasive compounds may also be included in the formulation. One common method for cleaning the lens is the friction contacts method. The lens is placed in the palm of a clean hand along with a few drops of the cleaner. The lens is then rubbed, front and back surfaces, for several seconds. The surfactants depend on the 1800 and contacts mechanical rubbing of the surface for cleaning.

Extended-wear (overnight) Lenses--rigid or soft--increase the risk of corneal ulcers, infection-caused eruptions on the cornea that can lead to blindness. Symptoms include vision changes, eye redness, eye discomfort 1800 or pain, and excessive tearing. The risk of corneal ulcers for people who keep extended-wear lenses in overnight is 10 to 15 times greater than for those who use daily-wear lenses only while awake, says the FDA''s Center for Devices contacts and Radiological Health. When the eyes 1800 and contacts are open tears carry adequate oxygen to the cornea to keep it healthy. But during sleep, the eye produces fewer tears, causing the cornea to swell. Under the binding down of a rigid contact lens during sleep, the flow of tears and oxygen to the cornea is further reduced. This lack of oxygen leaves the eye vulnerable to infection. Extended-wear rigid lenses also can cause unexpected, sometimes undesirable, reshaping of the cornea.