1, children should be examined before optometry: check whether the child has other eye diseases that cause refractive error, is the prerequisite for accurate optometry and prescription. The ophthalmologist must use slit lamp microscope, ophthalmometer, fundoscope and other general eye examination of the anterior and posterior segments and eye position, early detection and early treatment of eye disease. Other special eye examinations are also required if necessary. 2, younger children must be dilated pupil optometry: children whose regulation is very strong, vision with instability. There are more complex refractive errors, such as high myopia, high hyperopia or high astigmatism, myopia or hyperopia combined with astigmatism. Those with normal fundus and refractive interstitial examinations by an ophthalmologist and poor visual acuity require dilated pupils to rule out the presence of refractive errors. For this reason, it is a clinical requirement that the pupil must be dilated to truly reflect the refractive state of the child’s eyes. Relying solely on the results of computerized optometry without dilated pupils can cause many hazards to a child’s eyes. First of all, the pseudomyopia in the child’s eyes will often “trick the computer” and cause false test results. Secondly, if a child has hyperopia or high astigmatism, the adjustment of the eye will “hide” part of the prescription, and the prescription from the computerized optometry will be lower than the true prescription. Dilated pupils paralyze the eye’s adjustment, resulting in an accurate refraction that objectively reflects the child’s refractive status. The pupil dilatation is actually the application of a dilating drug that paralyzes the ciliary muscle so that the doctor can accurately examine the refractive error through the retinoscopy technique. The doctor is able to quickly and accurately examine the nature and magnitude of the refractive error without requiring much cooperation from the patient. The method does not require judgment or expression from the patient. Therefore, young children who do not know how to check their visual acuity and amblyopes who do not have sharp vision can be checked with accurate results by this method. It is especially suitable for children. 3.Children’s vision changes a lot and need regular ophthalmic review: Children are still in the process of growth and development, especially preschoolers and adolescents. Preschool is the critical period of visual development, the farsightedness is gradually reduced, and the eye development is close to that of adults. Adolescence is the second peak of eye development, and myopia mostly appears during this period and gradually deepens, stopping at the end of adolescence. Therefore, most children need annual optometry, and some younger children even need half-yearly optometry and vision check every 3 months, and timely replacement of glasses or lenses according to the change of eye prescription, never like adults who wear a pair of glasses for several years. Children wear more glasses, and as they use them for a longer period of time, the lenses will wear out, which is difficult to detect with the naked eye. Also, because the wear process is gradual, there is not much discomfort when wearing them. Glasses are worn to see clearly on the one hand and to protect your eyesight on the other. However, lenses that wear too much can in turn harm the wearer’s vision, so they must be replaced in time. In fact, these concerns are unnecessary. The effect of the medication is temporary, and the pupil and adjustment function will gradually recover after stopping the medication, which is not only harmless to the eyes, but also has a therapeutic effect on pseudomyopia and visual fatigue caused by adjustment tension.