A cataract is a painless, cloudy area in the lens of the eye that blocks the passage of light to the retina, the nerve layer at the back of the eye, usually causing vision problems.
A cataract occurs when the lens of the eye becomes cloudy. Aging and exposure to ultraviolet radiation can cause cataracts. Changes in the lens of the eye are often a normal part of the aging process and are common in older people, but they do not necessarily lead to cataracts.
Cataracts can also occur after an eye injury, as a result of eye disease, after the use of certain medications, or as a result of medical conditions such as diabetes.
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