Cataracts A cataract is a clouding of the eye’s normally clear lens, which leads to a progressive blurring or dimming of vision. It is the world’s leading cause of blindness and among the most common conditions related to aging – by age 65, you have a 50 percent chance of developing a cataract, and, by age 75, it jumps to 70 percent. A cataract starts out small and initially has little or no effect on vision. As the cataract progresses, it becomes harder to read and perform other normal tasks. In the early stages, your doctor may recommend stronger eyeglasses and adjusting your lighting to reduce glare. When cataracts disrupt your daily life, your doctor may recommend cataract-removal surgery, which is one of the most frequent and successful procedures done in the U.S.