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More than 25 million people worldwide are affected by age-related macular degeneration and cataracts, which according to the American Optometric Association is the leading cause of blindness in people over age 55. These diseases are often caused by oxidation and inflammation of the eyes, but research has found that foods rich in the nutrients lutein and zeaxanthin can reduce the risk of chronic eye diseases. Other studies have found that a diet rich in vitamins C and E, beta carotene, zinc, and omega-3 fatty acids can also prevent age-related eye diseases. Here are six top sources you should start eating now to improve eyesight.