Vitamin a and vitamin b have certain effects on preventing visual impairment. Vitamin A can regulate the synthesis of rhodopsin, a photosensitive substance in retina, improve the adaptability of night workers to dim light and prevent visual fatigue. Therefore, we should eat more foods rich in vitamin A, such as carrots, leeks and eels, and animal foods rich in vitamin B, such as lean meat, fish and pig liver. In addition, we should properly supplement calories and eat some fruits, vegetables, meat, eggs and other protein foods to supplement physical exertion, but don't eat too much. Dr. Li Changping believes that eating some dried fruits such as peanuts, almonds, cashews and walnuts is rich in minerals such as protein, vitamin B, vitamin E, calcium iron and vegetable oil, while the cholesterol content is very low, which has a special effect on restoring physical fitness. People who stay up late should not only work hard on diet, but also strengthen physical exercise. If you feel lack of energy or want to sleep during staying up late, you should do gymnastics for a while or do some outdoor activities. Because staying up late will take up the time of normal sleep, you may wish to act according to circumstances in supplementary sleep. For example, when you come home from work, you can close your eyes in the car for a while, or arrange a short nap for yourself during your lunch break at work, which can not only restore your strength, but also refresh yourself.