People who stay up late are mostly people who do word work or often operate computers. Fighting hard all night in dim light is easy to make eye muscles tired and eyesight decline. Vitamin a and vitamin b have a certain effect on preventing vision loss. Vitamin A can regulate the synthesis of rhodopsin, a photosensitive substance in retina, improve the adaptability of people staying up late to dim light and prevent visual fatigue. Therefore, we should eat more foods rich in vitamin A, such as carrots, leeks and eels, as well as lean meat, fish and fish rich in vitamin B.