carrot: There’s some truth in the old wisdom that carrots are good for your eyes. Carrots are rich in beta-carotene, which is converted into vitamin A in the liver. Vitamin A is transformed in the retina, to rhodopsin, a purple pigment necessary for night vision.
Beta-carotene has also been shown to protect against macular degeneration and senile cataracts. A study found that people who eat large amounts of beta-carotene had a 40 percent lower risk of macular degeneration than those who consumed little.