The cause of myopia is usually bad eye habits, so in ordinary life, in order to prevent the appearance of myopia, you need to do the following points. First, try to reduce the time of close eye use, such as close reading, the use of computers, cell phones and other electronic products generally do not exceed half an hour in a row, the total time of not more than 2 hours a day. Second, to maintain the correct reading distance, generally require reading distance in the 35-40cm or so. Third, to properly increase outdoor time, which is currently recognized as the most effective way to prevent the development of myopia. If you can ensure 2 hours of outdoor time every day, the incidence of myopia will be greatly reduced. Fourth, to avoid bad eye habits, such as reading in a rocking car or lying down to read a book.