The time required for glasses fitting needs to be determined according to the specific condition of the eyes. Fitting a pair of clear, comfortable and long-lasting eyeglasses requires the steps of optometry, lens fitting and processing, which usually takes 1-1.5 hours. 1. Optometry: accurate refraction of the eyes can only be obtained through accurate optometry. Objective optometry is required first, and common methods include computerized optometry and screening optometry. After obtaining the objective refractive error, a subjective refraction is required to determine the spherical and cylindrical refractive error as well as the axial position of the cylindrical lens. Under smooth conditions, the optometry procedure takes about 20 to 30 minutes. 2. Fitting: After the optometry is done and the exact refractive error is obtained, the refractive error cannot be used to fit the lens directly, but a fitting is needed. By adding the number of degrees to the trial frame, wearing the trial frame to try on. If there are any problems with discomfort during the trial, adjustments will need to be made to the prescription. It takes 10-20 minutes of full fitting to finalize the prescription lenses. 3. Processing: After the prescription number is determined, according to the selected lenses, frames, and the customer’s pupil distance, pupil height and other parameters, the processor will process the lenses on the spot. First machine processing and then manual grinding and finally adjusting the frame, regular glasses processing takes about 40 minutes. Nearsighted patients are advised to consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment and care.