Medical optometry is very necessary for eyeglasses, especially for young people under 15 years old, who need to go to a formal organization for medical optometry, rather than a simple computerized optometry to solve the problem. So, why do we need to do medical optometry for eyeglasses? Medical optometry is based on a detailed examination of the eye. Advantages of medical optometry: 1. Medical optometry breaks the practice of conventional optometry that only allows patients with refractive errors to see more clearly. 2. 2, medical optometry can make patients see more clearly at the same time also has the function of visual health care. 3, the effect of medical optometry is significantly better than conventional optometry, through medical optometry, wearing frames or contact lenses, will not occur fatigue, and can control or slow down the development of myopia. While conventional optometry does not take into account other aspects of visual function, i.e. synoptic function, fusion function, stereopsis function, etc., it is easier to control or slow down the development of myopia. Stereopsis function and other factors, it is easy to have visual fatigue or even myopia deepening. Therefore, the doctor emphasized that myopia and refractive error are blinding eye diseases, the child’s first optometry should not be greedy for cheap, should go to the regular ophthalmology medical institutions to check, it is responsible for the child’s practice.