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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 or pain, and excessive tearing. the risk of corneal ulcers line for people who keep extended-wear lenses in overnight is 10 to 15 times greater than for those who use daily-wear lenses contact only while awake, says the fda''s center for devices and radiological health. when the eyes are open tears carry adequate oxygen to the cornea lenses to keep it healthy. but during sleep, the eye produces fewer tears, causing the cornea to on 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 line the eye vulnerable to infection. extended-wear rigid lenses also can cause unexpected, sometimes undesirable, reshaping of the cornea.

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 or pain, and excessive tearing. the risk of corneal ulcers line for people who keep extended-wear lenses in overnight is 10 to 15 times greater than for those who use daily-wear lenses contact only while awake, says the fda''s center for devices and radiological health. when the eyes are open tears carry adequate oxygen to the cornea lenses to keep it healthy. but during sleep, the eye produces fewer tears, causing the cornea to on 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 line the eye vulnerable to infection. extended-wear rigid lenses also can cause unexpected, sometimes undesirable, reshaping of the cornea.

an added benefit is that soft lenses aren''t as likely as rigid lenses to pop out or capture foreign material like dust underneath. extra-thin soft lenses are available for very sensitive people. while the ability to hold water increases oxygen permeability of soft lenses, it increases their fragility as well. rigid lenses generally give clearer vision. they can be marked to show which lens is for which eye. they contact don''t rip or tear, so they''re easy to handle. also, rigid lenses don''t absorb chemicals, unlike soft lenses, which are like sponges. they''ll suck up any residues on your hands--soap, lotion, whatever. both soft and rigid lenses offer bifocal correction. in some models, each lens corrects for near and distance vision. in others, one lens is for near vision, and the other is for distance. middle-aged people who have good distance lenses and on vision but need help for reading can get a monovision reading lens for one eye.

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