It is very important to fit the glasses properly, the optical center of the glasses and the pupil distance error is very high, otherwise it will cause prismatic effect of visual fatigue, some myopic patients may also suffer from occult obliquity, cone cornea, and other eye diseases, which need to be taken into account in the prescription, so the prescription of glasses in the professional ophthalmology for medical optometry and checkups is the key. The initial fitting procedure should be as follows: 1. General ophthalmologic examination: exclude other eye diseases through external eye, refractive interstitial and fundus examination. 2. 2.Detailed optometry (shadow test or dilated pupil): if necessary, laser measurement of the eye axis, corneal curvature, corneal thickness, corneal topography. 3.Comprehensive optometry and insert trial lens: according to different needs to give full or retain part of the degree. The trial lens should be comfortable for the wearer. 4.Pupil distance measurement: should consider the different needs of near or far use. 5. Choose frames and lenses: consider the pupil distance, face shape, performance and quality. Wearing contact lenses should also pay attention to the sterilization of lenses to prevent corneal infection.