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Cataracts

A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.

A scene as it might be viewed by a person with Cataract:
Cataract
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Department of Health and Human Services NIH, the National Institutes of Health USA.gov