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The long and short of contact lenses.

The long and short of contact lenses

The largest study yet of contact lens use in the United States indicates extended-wear lenses--those worn overnight--carry a 2 to 4 times greater risk of serious complications than daily-wear lenses. The study of 22,500 lens wearers reveals greater risk of sight-threatening complications, such as serious corneal abrasion, growth of blood vessels onto the cornea, corneal ulcers and severe corneal scarring.

Scott MacRae of the Oregon Health Sciences University in Portland found that daily lens users sufer corneal ulcers -- sores that can lead to infection and loss of sight -- at a rate of about 1 in 2,000 yearly and that 1 in 300 daily lens wears suffers other serious complications. Among extended-wear users, which includes both costmetic wear and use by patients after cataract surgery, MacRae found rtes of 1 in 500 for corneal ulcers and 1 in 100 for others serious reactions. The study, based on case histories gathered by lens manufacturers for the Food and Drug Administration from 1980 to 1988, includes patients who were followed from three to 24 months.
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Title Annotation:extended-wear lenses found to have higher health risks
Author:Eron, Carol
Publication:Science News
Date:Oct 8, 1988
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