eye exam

Lenses should be thoroughly rinsed after cleaning because residual cleaning agents may lead to ocular irritation. Other methods for cleaning include spray cleaning, hydraulic cleaning and ultrasound cleaning. Soaking solutions. Soaking solutions are used to store hard contacts when not in use. The dry surface of a 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 eye exam the lens in a constant state of hydration to exam provide for maximum eye comfort and visual acuity. exam 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, eye concentrations of which are typically higher than in wetting exam solutions; soaking solution should be rinsed from the lens before insertion eye to avoid exam any possible toxicity from the preservatives.

extended-wear (overnight) lenses--rigid or soft--increase the risk of corneal ulcers, eye infection-caused eruptions exam 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 eye ulcers for people who keep extended-wear lenses in overnight is 10 to 15 times greater than for those who use daily-wear lenses exam only while awake, says the fda''s center for devices eye and radiological health. when the eyes 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 exam 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.

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