A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging, they are very common in older people but younger people can get them, too. By the age of 80 more than half of all American will either have a cataract or had cataract surgery. I have found a couple of websites with information about cataracts:
A Complete Guide to Cataracts
Facts About Cataracts
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