Cataracts are a common cause of poor vision among adults, particularly for the elderly.
More than 1.4 million people have cataract surgery in the United States every year. A cataract is a clouding of the clear lens of the eye. When the lens becomes cloudy, it interferes with the passage of light through the eye, resulting in a decrease in vision. The lens is contained in a sealed capsular bag. As old cells die, they become trapped inside the capsule.