I. What is myopia? Nearsightedness means that when the eye does not use regulation, parallel light rays are focused in front of the retina after refraction by the eye’s regional light system. The classification of myopia: low, diopter below 3.0D; moderate, diopter in 3.0-6.0D; high, greater than 6.0D. Clinical manifestations: Visual acuity The main manifestation is poor distance vision, near vision is more normal, children often show squinting at distant targets, to improve vision through small lid fissures. IV. Treatment (1) Prevention of myopia: Myopia focuses on prevention. Simple myopia occurs at a later age, mostly in preadolescence or adolescence, genetic factors are not certain or obvious, refractive error is generally low to moderate, good correction of distance vision, and other functions of the eye are normal. Reducing the adverse effects of visual load is the key to preventing simple myopia. The primary and secondary school years are the high incidence of myopia and the best time to prevent it. For those who are at risk of myopia, especially children with unstable visual acuity, the following preventive measures can be taken: don’t use your eyes for too long at a time, take part in outdoor activities, and do eye exercises for visual acuity-adjustment-assembly training, so as to regularly increase the visual distance, open up the field of vision, and maintain normal visual function; combine work and rest, and ensure sufficient sleep; eat a balanced diet and have reasonable nutrition; Improve learning conditions, lighting should be standard; cultivate the correct reading and writing posture, and develop good eye hygiene habits. (2) Correction of myopia For children younger than 15 years old, dilated eye examinations are required. If the visual acuity is poor, it is recommended that the child be fitted with glasses as soon as possible, which can reduce the child’s visual fatigue and to a certain extent slow down the development of myopia, which is beneficial to controlling the development of myopia.