Red-green weakness is more common, the patient has poor perception of red and green, when the illumination is poor, the color is light, and its color discrimination ability is close to red-green blindness; however, when the material color is dark, sharp and the illumination is good, its color discrimination ability is close to normal. There is no effective treatment for color vision, but if the color vision is red-green, you can correct it by wearing red or green soft contact glasses. The prevention and treatment of acquired color vision disorder is mainly the treatment of the original disease, the original disease is cured and improved, color vision disorder is often disappeared or reduced. Food to prevent green weakness: 1, containing vitamin A food Food containing vitamin A can prevent dryness and degeneration of the conjunctiva and cornea, can prevent and treat “dry eye disease”. The cornea of the eye dry, prone to bacterial invasion and ulceration, can cause perforation, resulting in blindness. Vitamin A also enhances the eyes’ ability to adapt to the dark environment. Severe deficiency of vitamin A when prone to night blindness. 2.Food containing vitamin C Vitamin C is one of the components of the lens of the eye, lack of vitamin C can easily make the crystal body cloudy, thus suffering from cataracts, give young children more food containing vitamin C. 3, calcium-containing foods Dietary calcium deficiency will cause increased neuromuscular excitability in young children, so that the eye muscle is in a highly tense state, thus increasing the pressure of the extraocular muscles on the eye, which is likely to cause visual impairment over time, so more calcium-containing foods for children, and infants and toddlers aged 0 to 3 years need to add 400 to 800 mg of calcium per day. The calcium content of milk and dairy products is second to none in human food, with more than 1 mg of calcium per 1 ml of milk, and the calcium in it is also easily absorbed by the body, so be sure to get into the habit of giving infants and children milk every day. In addition, burning ribs soup, sugar and vinegar ribs and other cooking methods can increase the content of calcium. 4, alkaline food body fatigue is due to the body’s acid ah metabolites mostly make the body environment acidic, eye fatigue is no exception. When the body’s environment is acidic, it will make the cornea, as well as the ciliary muscle with the regulation of eye fatigue changes, elasticity and resistance to decline, easy to form myopia and amblyopia. If you eat more alkaline food, you will neutralize the acidic environment in your body, thus relieving eye fatigue.