China is a region with a high incidence of myopia, and the prevalence of myopia among adolescents is increasing year by year, with a tendency to develop at a younger and higher age. Moreover, the pressure of schooling and environmental factors related to the modernization of life, such as the popularity of computers, will continue to have an impact on the prevalence of myopia. Vision loss in primary and secondary school students is an important issue currently affecting the health of young people and is related to the improvement of the health quality of the whole nation. Myopia is not only a medical problem, but has also become a social problem of common concern to the general public. How to effectively prevent and treat myopia and protect young people’s eyesight is a major issue that needs to be resolved urgently, and it is also a major issue that requires everyone’s knowledge and participation. Unfortunately, there are still many people who know less about myopia prevention and treatment, so they do not pay enough attention to prevention and improper treatment, which contributes to the occurrence and development of myopia. Visual acuity is a characterization of the ability of the eyes, the visual acuity depends mainly on the ability to accurately focus on the retina, followed by the eye neurons, the brain reading function and other physiological functions of the brain and the eyes sound or not. Myopia is originally a Chinese medical condition. It is a disease in which parallel light rays fall in front of the retina after refraction by the refractive system of the eye in a relaxed state. Ancient medical books on this disease has been recognized, known as the eye can not be far-sighted, also known as can be close to fear of far disease, to the “eye scripture Dacheng” began to say myopia. Myopia in Chinese medicine is equivalent to myopia in Western medicine. First, the main performance of myopia: 1, far vision loss, near vision is normal This is the most prominent symptoms of myopia. Although, the higher the degree of myopia, the worse the distance vision, but there is no strict ratio. Generally speaking, myopia above 3.00D, distance vision will not exceed 0.1; 2.00D in 0.2 to 0.3; 1.00D up to 0.5, sometimes may be better. Visual fatigue is especially common in low vision, but not as obvious as hyperopia. It is due to the incoordination of adjustment and collection. High myopia due to focus on the target is too close to the eye, the collection role can not be coordinated with it, so more monocular focus, but does not cause visual fatigue. 3, eye position Because myopic eyes do not need to adjust when looking at the near, so the collection function is relatively weakened, when the muscle balance can not be maintained, the visual function of both eyes will be destroyed, only rely on one eye to see things, the other eye is biased to the outside, becoming a temporary alternating strabismus. If the visual function of the deviated eye is extremely poor and the deviation occurs earlier, the deviated eye may lose its ability to fixate vision and become monocular exotropia. 4. Eyeballs The eyeballs of eyes with low or moderate myopia usually have no degenerative changes. In high myopia, most of them belong to axial myopia, the anterior and posterior axes of the eyeball are elongated, and their elongation is almost limited to the posterior pole. Therefore, the eyeball is often more prominent, the anterior chamber is deeper, and the pupil is larger and less reflexive. Since there is no stimulation of regulation, the ciliary muscle, especially the cycloplegic part, becomes atrophic, and in very high myopia, the crystal can not support the iris at all, and thus mild iris nystagmus occurs. 5, fundus Highly myopic eyes, due to the excessive elongation of the eye axis, can cause degenerative changes of the fundus. Tips: The visual state of adolescents is characterized by looking at near objects for most of the time, and the retina has a large opportunity to receive stimulation. With the increase of age, the eye axis grows day by day, and the refractive error naturally deepens. At puberty, the rate of increase in refraction reaches its peak, that is, it becomes deep myopia. This is also the reason why myopia in adolescents increases rapidly in middle school. Myopia is associated with close work. Therefore, in order to avoid myopia, it is natural to start from improving the habit of working in close proximity. Simply put, you need to develop reading habits that are easy and natural. This includes the ability to cultivate peripheral awareness; reading often look away from the habit; good lighting from the upper left side of the desk; as well as maintain a comfortable reading posture, etc. Second, the prevention of myopia 1, adhere to consciously do eye exercises, regular visual acuity examination. 2, to prevent excessive eye use, close work should not be more than 50 minutes at a time is appropriate, each hour should rest 10 minutes, the eyes far away relaxation of regulation, can prevent myopia. 3, take the appropriate light source reading, do not read in direct sunlight or dark place; maintain the correct reading posture, do not lie down, lying down or walking, reading in the car. 4, pay attention to personal eye health, keep clean around the eyes. 5, feel eye fatigue, should close the eyes for half a minute, but do not use your hands to rub your eyes directly. 6.Don’t be partial to picky food, don’t eat too much sugar. 7, Chinese medicine prevention, food therapy first. Prevention of myopia a few therapeutic recipes: 1, take schizandra (fried charcoal) 4 grams of green tea 1 gram, 25 grams of bees, decoction, 1 dose per day, there is a clear liver and eyesight. 2, take salt fried goji berries 10 grams, 10 grams of white chrysanthemum, black tea 1 gram, boiling water, drink tea, nourishing the liver and kidney, liver and eyesight function. 3, take 2 eggs, jujube 6 ~ 8, wolfberry 15 ~ 30 grams. The three medicinal materials are stewed, after the egg is cooked, remove the shell and then slightly boiled. Daily or every other day 1 dose, divided into 1 ~ 2 times to eat, have the effect of nourishing yin and nourishing blood.