Measurement of the required spectacle prescription needs to be carried out in a qualified hospital or optical store, where the naked eye, corrected visual acuity and the required spherical lens are calculated under the examination of an optometrist. The measurement of the required spectacle prescription differs between children and adults. As children have greater self-adjustment ability, they need to dilate their pupils to minimize the error caused by self-adjustment before undergoing the primary vision test, and then undergo the computerized vision test and the primary vision test. Computerized optometry and photoplethysmography can provide a certain reference for the subsequent precise optometry but are not accurate enough, and subjective optometry requires the patient to read the visual standard at a distance of 6 meters without or with lenses, and in the process of replacing the spherical lenses and cylindrical lenses several times to seek for an optometric prescription that will make the patient feel comfortable, have a clear vision, and have long-lasting use of the eyes.