Green food is a collective term for safe, high-quality and nutritious food that is free from pollution. As things related to environmental protection are usually labeled "green", in order to highlight the food from a good ecological environment, so the name is green food. Green food is divided into AA grade and A grade, AA grade refers to the food production process does not use any harmful chemical synthetic substances, A grade refers to the production process is allowed to use a limited number of limited chemical synthetic substances. Because green food contains: a. Provide sufficient vitamin A: Vitamin A is an important raw material that constitutes the photoreceptor of the eye, protects the eye and other epithelial tissues, and indirectly resists the function of infection. Vitamin A is sufficient to increase the cornea of the eye cornea of the brightness of the eyes, so that the eyes bright, look bright. Second, add enough protein: the retina of the eye on the retina of the retina by the protein composition, lack of which in addition to muscle weakness, dysplasia, easy to infection, edema, anemia, but also visual impairment. Therefore, to give the child to eat more protein content of food, such as lean meat, fish, milk, eggs and soy products. Third, can not lack of calcium and phosphorus: calcium and phosphorus can make the sclera tough, and involved in optic nerve physiological activities. When calcium and phosphorus are lacking, it is easy to have visual fatigue and distraction, which will easily cause myopia. Vitamin C, B1 and B2 are indispensable: Vitamin C is an important nutrient for the lens of the eye, and insufficient intake will make the lens of the eye cloudy, and it is one of the important causes of cataract. Foods rich in vitamin C include oranges, citrus, grapefruit, tomatoes, various fruits and vegetables, etc. Fresh jujubes and lemurs are more abundant. Vitamin B1, B2 is involved in the metabolism of nerve cells, including the optic nerve, and has the role of protecting the eyelid conjunctiva, conjunctiva and cornea, but also to prevent and delay the formation of the outer canthus and corner of the eye lines. V. Trace elements should not be ignored: although the content of trace elements in the human body is less than one percent of body weight, but the role is very large. Without them, metabolism is difficult to carry out, and children's health will be affected. Trace elements such as zinc, chromium, molybdenum, selenium, etc., are also involved in the metabolism of various substances in the eyes, regulating their physiological functions, which should not be ignored

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