Your eye has a clear lens
through which light passes allowing you to see. When the lens loses
its transparency, the cloudy tissue that develops is known as a
cataract.
Cataracts cause progressive, painless
loss of vision. The lens clouds naturally as we age, so people
over the age of 65 usually see a gradual reduction of vision. No
one is exactly sure what causes cataracts. In younger people
they can result from an injury, certain medications, or illnesses such
as diabetes. Prolonged exposure to ultraviolet light may also
play a role in the formation of cataracts. Studies have also
shown that people who smoke cigarettes have a higher risk of
developing cataracts than non-smokers.