Corneal dry spots are dry corneal spots that form due to the accumulation of corneal epithelium and are seen primarily in vitamin A deficiency diseases. It is an ocular manifestation of systemic nutritional disorders and vitamin A deficiency. Vitamin A is involved in a variety of physiological functions such as visual formation, maintenance of epithelial tissue integrity, participation in immune regulation, and promotion of growth and development. Due to the limited food sources of vitamin A and the specificity of young children’s diet, vitamin A deficiency has become a common nutritional deficiency disease in babies. Vitamin A is a fat-soluble vitamin, and its active form, retinol, is found only in animal liver, egg yolk, and milk. Cod liver oil is the most common vitamin A and D complex. Plant foods do not contain vitamin A, but do contain beta-carotene, a prerequisite for vitamin A, which is found primarily in dark green, yellowish-red, and reddish vegetables and fruits. After entering the body, carotenoids can be converted to vitamin A in the wall of the small intestine and the liver, but the conversion rate is about 1/6 ∽ 1/24. To avoid vitamin A deficiency in young children, it is recommended to eat an egg every day, ensure at least 300-400 ml of whole milk, and the best thing to eat once a week is the liver of an animal (about 25 grams), together with an appropriate amount of colored vegetables and fruits, can satisfy the young children’s need for vitamin A. Vitamin A can accumulate in the liver. Vitamin A can accumulate in the liver, and toxicity can occur when it is overdosed, so don’t consume it in excess, and don’t take cod liver oil blindly as a tonic.