Nine-year-olds who develop myopia are advised to try keratoplasty lenses, which, by wearing them during sleep, exert some pressure on the cornea so that normal vision can be achieved during the day the next day. This is due to the fact that keratoplasty changes the shape of the cornea, i.e., it changes the refractive power of the cornea in a short period of time, so that the parallel rays of light incident on the eye can be accurately focused on the retina, and the long-term use of these glasses can slow down the development of myopia. However, in addition to wearing glasses, it is more important to standardize the use of eyes in daily life, to avoid eye strain and discomfort caused by prolonged use of eyes, and to engage in more physical activities, which can effectively prevent myopia from deepening.