Generally, you can judge whether you have myopia or not according to the computerized optometry test, photoplethysmography, comprehensive optometry and other examination methods. 1. Computerized optometry testing: Computerized optometry is an objective optometric method, which uses infrared light source and automatic fog vision device to relax the eyeballs, and at the same time, adopts photoelectric technology and automatic control technology to test the refractive error of the eyeballs, so as to judge whether the patient is myopic or not. 2. Shadow Checking Optometry: Shadow checking optometry is a kind of objective optometry, which is mainly based on the shadow movement of the retina to judge the refractive condition of the eyeballs, so as to determine the refractive index of the eyeballs, and then determine whether the patient is myopic or not, and it is applicable to children under 12 years old. 3. Comprehensive Optometry: Comprehensive Optometry refers to the optometric equipment with comprehensive ability, which is mainly used to obtain the patient’s best vision prescription through subjective optometry to determine whether the patient is myopic or not. It is recommended that patients who have trouble seeing clearly should go to the ophthalmology department of the hospital in time, and under the guidance of the doctor for vision examination and treatment. At the same time, patients should pay attention to the control of eye use, avoid looking at the cell phone as well as the computer for a long time, and do outdoor exercise.