Myopic children’s visual acuity is 0.3, which is considered to be a moderate vision loss, the first thing to do is to take the child to a regular hospital eye examination, once diagnosed with myopia, the degree will inevitably develop and deepen, so the scientific prevention and control of myopia is particularly important. 1. establish a visual health file for the child, optometry to determine the degree of follow-up every six months to a year. 2. increase outdoor activities, children should ensure that there is enough effective Children should have enough time for outdoor activities, averaging about 2 hours per day and 14 hours per week.3. Reduce the continuous use of eyes at close range, reduce the load and reduce the amount, too much continuous use of eyes at close range tends to aggravate myopia, reduce the use of eyes at close range, especially reduce the continuous use of eyes at close range, can prevent the development of myopia. It is recommended that every 30-40 minutes of continuous near eye use should be followed by a 10-minute break or a 10-minute lookout.4. Stay away from electronic products and reduce the use of cell phones and iPads by children.5. There are various myopia correction methods. The lenses can be used to delay the deepening of myopia. In summary, scientific understanding of myopia, early prevention, early intervention, prevention and treatment.