The human eye is changing throughout the life, especially in the teenage period, with the development of the body, the eyes are also developing and changing, 1-2 times a year eye examination, is to find a health guard for their eyes, and at the same time to see whether the glasses currently worn are still suitable for their eyes. At present, there are still many unqualified glasses on the market, and the unqualified glasses are mainly manifested in the following points: 1, inaccurate optometry Certain parents think that the lower the prescription of glasses, the better, in fact, it is wrong, the main function of the glasses is to meet the patient’s daily visual requirements, if the prescription is too low, on the contrary, it will make the patient’s daily visual blur, resulting in eye fatigue, so it is usually necessary to correct the visual acuity to 1.0, astigmatism to 1.0, and the astigmatism to 1.0. Therefore, the visual acuity should be corrected to at least 1.0, and the astigmatism should be corrected as fully as possible, otherwise it will also easily lead to eye fatigue. At the same time, the visual acuity of both eyes should be balanced, so as to have good stereoscopic vision and balanced adjustment of both eyes. Optometry is the main basis for fitting. The accuracy of optometry is directly related to the appropriateness of the glasses. Optometry first degree to be accurate, myopia can not be overcorrection; second astigmatism and axial to be accurate; again, the pupillary distance to be accurate, the pupillary distance to be equal to the optical center of the lens distance, if the optometry does not pay attention to the above gatekeeper, the preparation of the spectacle lenses will be blurred visual imaging, long vision fatigue, dizziness, nausea, and even diplopia and other adverse reactions. 2, inaccurate prescription patients with glasses still exist in the pupil distance difference, the optical center of the two eyeglass lenses is not the same height, lens luminosity, astigmatism axis is not accurate and other issues, so we recommend accurate optometry also need accurate prescription, otherwise it is the same as the doctor’s diagnosis is accurate, the medicine given is wrong or even harmful, which is more than worth the loss. 3, the frame is not suitable Some patients wear a pair of glasses for many years, when brought to us, has been seriously deformed, the deformation of the glasses frame will cause the location of the glasses lens is inaccurate, which will result in the failure of the glasses. In addition, for patients with high myopia or high astigmatism, give the selection of a surface curvature of the frame, the result is that the patient is very uncomfortable to wear. When choosing frames for eyeglasses, special attention should be paid to the fact that the choice of frames is not only aesthetically pleasing, but also has a great deal to do with whether or not the eyeglasses can be worn correctly. The distance between the pupil and the optical center of the spectacle lens should be placed in a suitable position, and should also be matched with the face, so that the glasses will not only be beautiful and generous, but also comfortable to wear.