Patients feel swelling, acidity, and burning in the eyes, and in severe cases, they may have headaches, dizziness, lack of concentration, and even nausea. Many eye diseases and certain chronic diseases can cause eye strain. Nutritional prevention and control 1, ban smoking, alcohol, coffee: less smoking and drinking alcohol and caffeinated beverages, because caffeine can affect vision. 2, more vitamin supplements: vitamin a can maintain normal visual function and help treat various eye diseases. In food can eat animal liver, egg yolk, green vegetables, fruits, etc. b vitamins can promote the metabolism of cells in the eye. Vitamin b2 helps to relieve eye fatigue. Dried beans, mushrooms, wild greens and alfalfa contain a lot of vitamin b2 and can be eaten in large quantities. Vitamin b5 (pantothenic acid) is anti-stress and may reduce eye strain. Meat, malt and bran, nuts and chicken contain a lot of pantothenic acid, so pay attention to supplementation. Vitamin c and vitamin e can destroy free radicals, reduce intraocular pressure and relieve fatigue, so you should eat more bean sprouts, soybeans, citrus, hawthorn and other foods that contain more vitamin c and vitamin e. 3, supplement selenium, zinc, calcium and other minerals: selenium can destroy the role of free radicals that damage the eyes, relieve fatigue. You can eat seafood, tomatoes, cauliflower and other foods rich in selenium. Zinc can prevent light damage and reduce eye fatigue. Therefore, you should eat more zinc-rich meat, seafood, mustard powder and other foods. Calcium is involved in the impulses of various nerves in the body, and nerve cells (including the optic nerve) lacking calcium are prone to visual fatigue and distraction.