The main reason for myopia caused by cell phones is that the reading distance is too close. In the early stages, this process is reversible, that is, after rest, it can be restored to normal, because the eye itself has a certain compensatory function. However, if this happens for a long time, the process will gradually become irreversible and develop into a stage of true myopia, which is also the cause of myopia. Therefore, in ordinary times must maintain reasonable eye habits, look at the phone time and distance should be controlled in the normal range, it is recommended not to exceed 2 hours a day, only in this way can avoid the occurrence of myopia to the greatest extent.