The main ways to prevent myopia in children are to control the distance between eyes, increase outdoor exercise, ensure sufficient sleep, and control the use of electronic products. 1. Control the distance between eyes: when children study or read books, the distance between eyes and books should be more than 33 centimeters, and the time should not be more than 45 minutes, maintain a good sitting posture, do not lie down to read and do not read in the car, and avoid reading and studying in the darker light. 2. Increase outdoor exercise: daily outdoor exercise can relax the eyes and reduce the risk of excessive growth of the eye axis, it is recommended to ensure more than two hours of outdoor exercise every day. 3. Adequate sleep: Sleep allows the muscles of the eyes to get enough rest, elementary school students should sleep more than 10 hours a day. 4. Control the use of electronic products: due to the popularity of electronic products, electronic products can be used to study, it is recommended that the study time should be controlled within 40 minutes, and rest need to look into the distance to relax the eye muscles, the younger the age of the use of electronic products should be the shorter the time. In addition to the prevention of myopia in life, you can also go to the regular hospital for preventive examinations.