Vitamin A deficiency is the main cause of night blindness. Under normal circumstances, vitamin A can be ingested from food and is an essential class of vitamins for the body. If the patient has poor eating habits, such as picky eating and partial eating, resulting in vitamin A deficiency, the most important symptom that can occur in this state for a long time is night vision and visual dysfunction, i.e. night blindness. As the disease worsens, it may lead to the formation of more serious eye diseases, such as corneal achromatopsia. Early manifestations of corneal chondromalacia are night blindness, followed by dry eyes and other discomforts, and examination reveals soft, thin corneas, and in severe cases, complications such as corneal ulcers and corneal perforations. Vitamin A supplementation is very crucial. Normal people should eat more vitamin A-rich foods such as carrots, and if they have night vision, they can take vitamin A type medication in addition to food supplementation.