Caused by chemical changes, cataracts form on the lens of the eye. They gradually limit vision as people age. The good news is that most cataracts can now be successfully treated with surgery. Most people older than age 65 have cataracts to some degree. But the opaque patches are usually still small or limited to the edges of the lens.
Cataracts progress slowly, causing minor vision problems at first.
Wearing a hat and sunglasses when outside may reduce a person's risk of developing cataracts. Not smoking may reduce that risk further. Some studies suggest it's also possible to prevent or delay cataracts by eating foods rich in vitamins A, C and E. Fruits and green leafy vegetables are high in these vitamins. For people who are unable to get these vitamins through diet, they might try supplements. Monitoring Symptoms Cataracts are painless and difficult to see with the naked eye.