The degree of myopia can be measured by retinal imaging, dilated pupil optometry, computerized optometry, etc. The retinal imaging method utilizes a detector lens to project light onto the retina of the myopic patient. 1. Retinal Projection: Retinal Projection is the use of a detector lens to project light onto the retina of a myopic patient, and the retina will radiate the light beam to the detector lens, at which time the optometrist can check the degree of myopia of the patient through the peephole of the detector lens. 2. Pupil dilation optometry: Pupil dilation optometry refers to before the optometry, under the guidance of the doctor in the eye part of the drop atropine and other pupil-dilating agents, which can make the eye ciliary muscle in a relaxed state. At this time, then optometry examination, so that optometry is not only accurate, and can distinguish between true myopia and pseudomyopia. 3. Computerized optometry: computerized optometry is the use of infrared light source, automatic fog vision device to make the eye regulation relaxation, and then the use of photoelectric technology and automatic control in time to check the degree of myopia. It is recommended that myopic patients go to regular hospitals for myopia checkups, and doctors will choose appropriate measures to intervene according to the patient’s degree of myopia.