A cataract is the clouding of the eye's natural lens. It is the most common cause of vision loss in people over age 40. Research suggests eating foods high in antioxidants like vitamins C and E may help delay cataracts. Citrus fruits, tomatoes, red and green peppers, kiwis, broccoli, strawberries are good sources of vitamin C. Sunflower oil, almonds, peanuts, broccoli, and spinach are good sources of vitamin E.