I recommend firstly you to eat more foods rich in vitamin A such as liver, eggs, cod-liver oil and butter because vitamin A helps epithele tissue of the body metabolize normally and keep the cornea away from dryness and degeneration. As beta carotene can be transformed into vitamin A in the body, so carrots, spinach, lettuce, water spinach, clove, pumpkin, tomatoes, edible amaranth, loguat, laver and petits pois are available in your diets. Vitamin C is a component of the crystalline lens of the eyeball, so you should take more fresh vegetables and fruits. Fish, especially the marine fish, which are rich in polyunsaturated fatty acids such as DHA and EPA can protect the retina. In addition, control your consumption of pungent foods and do not smoke in your daily life, nor drink too much alcohol.