Myopia patients are unable to measure myopia on their own, patients need to go through optometry to determine the degree of myopia. Optometry is further divided into subjective and objective optometry. Objective optometry is computerized optometry, photographic optometry, and then subjective insertion optometry according to the degree of myopia. Generally there are differences in the way myopia is measured in different groups of people, such as adults and adolescents, children have different ways of optometry. 1. Adults: Adults can directly carry out computerized optometry or photoplethysmography, and do not need to dilate the pupils for examination, and then insert the film for trial wear, with the best corrected visual acuity and the lowest degree for the first trial wear, and the degree that is clear and comfortable after wearing the trial wear glasses is more appropriate. 2. Teenagers and children: Teenagers and children have very strong eye adjustment ability, and need to be dilated optometry. Pupil dilation is divided into rapid dilation and slow dilation, generally more than 8 years old can be rapid dilation, such as the use of compound tropicamide eye drops, etc., children under the age of 8 years old are recommended to chronic dilation, the use of atropine ophthalmic gel, and then the operation of the optometry is the same as that of adults. It is recommended that myopic patients consult regular hospitals and follow the doctor’s instructions for examination, to clarify the specific degree of myopia, as well as treatment and care.