Myopia is a common eye disease that directly affects the healthy growth of adolescents. The prevalence of myopia among children and adolescents in China is increasing year by year, with statistics reaching 40% for elementary school students, 70% for secondary school students and 90% for college students. Therefore, knowing how to take care of eyes to prevent myopia has become a concern for the whole society. What is myopia? Generally speaking, we call it myopia when we can’t see things at a distance and see things clearly at a distance. Medically speaking, myopia is a condition in which parallel light rays pass through the refractive system of the eye and form a focal point in front of the retina when the eye is at rest. The exact cause of myopia is unclear. Myopia is the result of a combination of environmental and genetic factors. Environmental factors are currently considered to be closely related to the development of myopia by working at close distances. For example, excessive near eye use and long continuous eye use time; poor learning environment, lighting does not meet the requirements, too strong or too weak light, are also the main factors in the formation of myopia. Prevention of myopia in adolescents 1, prevention of myopia: Myopia has a certain regularity, we should pay attention to the good period of vision care, environmental myopia prevention measures mainly include: (1) close eye time should not be too long, every 45 to 60 minutes to rest 10 to 15 minutes. When resting, you should look far away from the window or do outdoor activities to make the eye adjustment muscle fully relaxed. (2) The light should be moderate when using the eyes at close range. Too much or too little light when using eyes at close range is an important factor in myopia. (3) The posture of the eyes at close range should be correct. (4) Actively participate in outdoor activities. Pathological myopia can be prevented through genetic counseling. If both parents are pathologically myopic, nearly 100% of the children will develop the disease. Prevent infections during pregnancy to avoid poisoning and allergies, etc. Preventing the progression of myopia: In recent years, the age of onset of myopia in adolescents has advanced, the prevalence has increased significantly, and myopia has shown a progressive trend, so it is very important to control the development of myopia, especially the progression of myopia in adolescents. First of all, in addition to the methods mentioned above, special attention should be paid to the rational use of the eyes and the selection of appropriate work to avoid excessive eye use and adverse visual stimulation. Secondly, to correct myopia wear appropriate glasses. Eyeglasses can be chosen from: single light lenses: simple fitting and easy to wear. For high myopia or binocular myopia degree difference patients glasses correction effect is not good. Juvenile progressive lenses: relatively single-vision lenses have statistical significance for myopia control in children, but no clinical significance. However, there is myopia control for patients with a high degree of adjustment lag at the near point of intraocular obliquity, and intraocular obliquity is the best indication for children to wear progressive lenses. Eyeglasses that control peripheral defocus: such as Growler lenses, by projecting the image at the center of vision onto the retina and its periphery onto or in front of the retina. Studies have proven that these peripheral vision control lenses delay myopia progression by 30% compared to traditional monovision lenses. Keratomileusis: Keratomileusis is a clinical technique for shaping the cornea by applying a series of specially designed high-permeability rigid corneal contact lenses that gradually flatten the surface curvature of the cornea to reduce myopia and improve naked eye vision. Research in recent years has shown that keratoplasty has significant myopia control and is currently the most effective form of myopia control.