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Definition
By Mayo Clinic staffA cataract is the clouding of the normally clear lens of your eye. In cataract surgery, an eye doctor (ophthalmologist) removes the clouded lens from your eye and, in most cases, replaces the lens with an artificial lens. Cataract surgery is usually successful — more than 90 percent of people who have a cataract removed enjoy improved vision after the procedure.
Why it's done
