Cataracts are cloudy chemical alterations that occur in the lens of the eye. Common symptoms of a cataract are difficulty seeing, like looking through a dusty windshield. The symptoms may be especially notable in the dark when head lights or other lights seem to shine or sparkle abnormally. Cataracts are more common with age and with exposure to sunlight.
Cataracts are treated surgically. A cloudy distorted lens is removed and an artificial lens is set in its place. Most cataract surgeries are done while you are awake, but you cannot see what is happening during the surgery. Cataract surgery usually costs about $3000.
In the US there are about 3 million cases of cataract surgery per year.