Myopia glasses are mainly prescribed through medical optometry, which requires a computerized optometry in a hospital, and the doctor will perform a contrast optometry based on the results of the computerized optometry. In the case of small children, especially those with high myopia, it is usually recommended to use dilated eye drops to dilate the pupil and reduce or lose the adjustment function, and then to perform a contrast optometry. After the screening test, a primary inset test is performed to see the corrected visual acuity and the primary optometry. Once the primary optometry is obtained, the first day of optometry is over, and you will need to come back the next day for a retest, after the pupil is of normal size. After the re-testing, usually after 20-30 minutes of trial wear, the myopia obtained can be used for the normal prescription of myopia glasses.