To protect your eyesight and prevent eye diseases, start by paying attention to nutrition. There are many foods in your daily diet that have the effect of improving your vision, and with a little attention, you can have a good effect on your eyes. Vitamin A Vitamin A is closely related to normal vision. Vitamin A is the main nutrient to maintain the normal metabolism of human epithelial tissues, can maintain the normal cornea, not to make the cornea dry, degeneration, and has the effect of enhancing the ability to see in the dark light. If the body lacks vitamin A, keratitis, dry eye disease, photophobia, tearing, and even thickening or softening of the conjunctiva and loss of vision can occur, resulting in night blindness or insomnia. The best food sources of vitamin A are various animal livers, cod liver oil, carrots, spinach, amaranth, sweet potatoes with red hearts, pumpkin and other vegetables that contain vitamin A original that can be converted into vitamin A in the body. Vitamin C Foods that contain vitamin C are also beneficial to the eyes. Vitamin C is one of the components that make up the crystalloids of the eye. If you are deficient in vitamin C, you are susceptible to cataract disease, which is a clouding of the crystal body. Vitamin C slows the onset of cataracts by reducing the damage to the lens of the eye from light and oxygen. Foods containing vitamin C include fresh vegetables and fruits such as persimmon peppers, tomatoes, lemons, kiwi and hawthorn. Calcium Calcium is the main constituent of bones and the main constituent of the sclera. High calcium content plays a major role in enhancing the toughness of the sclera, so calcium deficiency can lead to myopia. Foods that contain more calcium include milk and its products, shellfish (shrimp), bone meal, beans and soy products, egg yolk and dark green vegetables. In addition, animal bones such as beef bones, pork bones and sheep bones are rich in calcium and are easily absorbed and used by the body. Zinc Myopia patients generally lack zinc, myopia patients should eat more food containing more zinc. Zinc deficiency can lead to visual impairment, and zinc is mainly distributed in the bones and blood. Zinc is also found in the corneal epidermis, iris, retina and lens, and is involved in the metabolism and transport of vitamin A in the eye, maintaining the normal organization of the retinal pigment epithelium and maintaining normal visual function. Foods that contain more zinc include meat, liver, eggs, peanuts, wheat, beans, grains, etc. Chromium is an essential trace element for the human body. It is now believed that myopia is related to the lack of chromium in the human body. Chromium is an indispensable auxiliary component of insulin, by participating in the process of sugar metabolism. When the human body is deficient in chromium, the role of insulin is reduced so that the use of sugar is impaired, and the increase in blood sugar causes a decrease in osmotic pressure, resulting in changes in the osmolarity of the lens and atrial fluid of the eye, prompting the lens to become convex, increasing refractive error and forming myopia. Generally speaking, children under the age of 10 have a high level of chromium in their bodies, but between the ages of 10 and 30, chromium in the body will suddenly decrease, so this stage is the most prone to myopia, should pay attention to the intake of foods containing high chromium. Animal liver, brown rice, corn, millet, wheat bran, coarse flour, brown sugar, grape juice, nuts, etc. contain more chromium, but the chromium content of food after processing will be greatly reduced, such as white sugar than brown sugar chromium content of 5/6 less, wheat after processing also reduced about 5/6 or so. Selenium In dietary nutrition, there is an extremely close relationship between the element selenium and vision. It has been observed that selenium is related to visual acuity and that rabbits given selenium injections will respond to weak light that has been imperceptible. Giving people foods with high selenium content enhances vision. The contraction of the muscles that govern eye activity, the dilation and narrowing of the pupil, and the normal color discrimination of the eye all require the participation of selenium. Among natural foods, selenium-rich rice, selenium-rich wheat, seafood, mushrooms, eggs, garlic and ginkgo are high in selenium, and people who are deficient in selenium can increase the food in this area appropriately. Lutein Lutein and zeaxanthin are the main components of the retinal macula. Lutein helps to reduce and delay the aging, degeneration and lesion of the eyes, reduce the incidence of eye diseases, and also protect the retina from light damage. The body cannot synthesize it on its own and must rely on food supplements. It protects vision and has a filtering effect on ultraviolet light. Lutein is highest in dark green leafy vegetables such as kale, collard greens, spinach, and flowers such as marigolds and marigolds. Eat a lot of green vegetables that can ensure the absorption of lutein, especially corn, carrots, spinach, purple kale, etc. Chinese wolfberry and chrysanthemum Chinese wolfberry can nourish the liver and kidneys, moisten the lungs and brighten the eyes; chrysanthemum for the treatment of eye fatigue, blurred vision has a very good effect, so drink three or four cups of chrysanthemum tea every day. Important: Children and adolescents should control eating sugar as much as possible after myopia, sugar eating too much, the increase in blood sugar content will cause the atrial water, crystal osmotic pressure change. When the osmotic pressure of atrial water is lower than the osmotic pressure of the lens, atrial water will enter the lens, prompting the lens to become convex and causing the onset of myopia. Eating too much sugar and high carbohydrates will make the tissues in the eye less elastic and reduce the storage of the trace element chromium, making the eye axis easier to become longer. At the same time, eating too much sugar can cause a large amount of acid to be produced in the blood. Acid is neutralized with salts in the body, especially with calcium salts, and is reduced in the blood, causing a decrease in blood calcium, which affects the toughness of the eye wall and makes the eye axis elongate, also causing the occurrence and development of myopia.