Information shows that the world average prevalence of myopia is 22%, and the prevalence of myopia in China is 35%, which is one of the countries with the highest prevalence of myopia. Myopia is a condition in which parallel rays of light enter the eye and gather in front of the retina when the eye is adjusted to rest, so that the distance vision is poor and the near vision is normal or good, and the distance vision can be improved with a concave lens. Myopia is generally divided into two categories, namely simple myopia and pathological myopia. The former is acquired myopia, also known as juvenile myopia; the latter is congenital high myopia. The occurrence of myopia in adolescents has a clear external cause – prolonged near eye use, so reducing the adverse effects of visual load is the key to prevention. First of all, you should develop good eye habits and reduce eye fatigue, such as reading, writing, watching TV, playing computer and other continuous eye time should not exceed 1 hour, generally use eyes for 45 minutes to 1 hour, to rest 10 minutes, actively participate in outdoor activities, after-school time to participate in some ball activities ( such as blue ball, table tennis, badminton, etc.), is very helpful to protect vision, international eye experts recommend daily Keep outdoor activities for 3.5 hours. Secondly, to maintain the correct reading and writing posture, often referred to the three “one” is the writing and reading, hand and pencil distance of one inch away, chest and desk distance of one fist away, eye and book distance of one foot away. Do these, but also can effectively reduce eye fatigue. Third, to have good lighting, light should not be too dark or too strong, it is best to use a strobe-free desk lamp, do not read under the conditions of shock, shaking. In addition, doing eye exercises, ensuring sufficient sleep, combining work and rest, reasonable nutrition, and maintaining physical and mental health are also beneficial to the prevention of myopia. For myopia correction, there are only two internationally accepted methods. One is glasses (including frames, contact lenses, keratoconstructions, etc.); the other is surgery (including RK surgery, PRK surgery, LASIK surgery, etc.). The other is surgery (including RK surgery, PRK surgery, LASIK surgery, etc.). Surgery can only be performed when a person’s growth has stabilized (18-20 years old) and the degree of myopia has stabilized. The reason is that these methods increase the excitability of the patient’s neurosensory cells, while the degree of myopia does not change in the slightest. Adolescents with myopia should always wear appropriate glasses to correct their vision, avoid further eye fatigue, and maintain normal eye function. The principle of prescription is to choose the lowest degree of concave lens that can achieve the best corrected vision and to make the optical center of the lens consistent with the pupil i.e. the pupil distance should be accurate, otherwise it will be harmful to the eye. To do this well, you must rely on an optometrist or ophthalmologist, especially for myopic eyes under the age of 14, you must ask your ophthalmologist to perform a dilated optometry (medical optometry), while using comprehensive optometry to finalize your glasses. For those who do not want to wear frames, contact lenses (also known as corneal contact lenses) can be worn, including soft contact lenses and hard contact lenses. Highly oxygen permeable hard contact lenses, also known as RGP, can stop or delay the deepening of myopia; another new type of digital corneal shaping glasses, also known as MCT lenses, for patients with myopia below 500 degrees, after wearing MCT lenses for a period of time (usually 2 to 4 weeks), vision can return to normal (but because the cornea has a memory function, myopia will return to its original degree after a few weeks of stopping wearing); in addition. For those who are 18 years old or older, the most advanced myopia correction method in the world today – Excimer laser treatment – is available. The procedure is approved by NASA and the military, whose personnel can be treated with excimer laser surgery. It is highly effective, predictable, stable and safe, and vision returns to normal within hours of treatment.