Cataracts
Cataracts are the leading cause of blindness worldwide. 24.4 million Americans have cataracts by age 40; more than 50 percent of those aged 80+ have cataracts.
What is a cataract?
A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.
A cataract can occur in either or both eyes. It cannot spread from one eye to the other.






