The degree of myopia can only be measured after a series of tests such as vision examination, computerized optometry and comprehensive optometry in an eye hospital. It cannot be obtained through self-testing. To detect myopia, you need to take a visual acuity test and a computerized optometry test. The optometrist will record the number of degrees of computerized optometry into the comprehensive optometry instrument, and then through the comprehensive optometry instrument on the fog vision, de-fogging vision, red and green test, accurate myopia degree of spherical lens. If there is myopia combined with astigmatism, the axial position and degree of astigmatism will also be accurate on the comprehensive optometrist. Finally, a binocular balance test is performed to slightly adjust the degree of myopia. This is the final test of myopia. If you are nearsighted, it is recommended to go to a formal institution to have a professional optometrist to conduct an optometry examination and fit the glasses according to the optometrist’s recommendations.