Optometry refers to the method of testing the eye’s visual acuity through medical testing means, optometry is generally made up of spherical lens S degrees (+ represents farsightedness, – represents myopia), column lens C represents astigmatism, astigmatism axis A represents axial, PD represents pupillary distance, according to these data on the optometry sheet can determine the degree of their eyes. Generally speaking, when the vision test is performed, the three values of S, A and C will be measured three times in a row to ensure the accuracy of the test, usually the final value obtained for the fourth time is the average of the first three times, for example, the S value of the right eye +1.10 represents 110 degrees of hyperopia, the A value 180 represents 180° of astigmatism axially, the C value -0.35 represents 35 degrees of astigmatism, and the PD value 79 represents 79 pupillary distance mm, you can judge the degree of your eyes by these values in the vision report. However, in addition to the values on the optometry sheet to determine the degree, but also need to combine the vision table to comprehensive test vision, because the visual acuity and refractive state is not proportional, there are different ages of people eye degree and eye function is also different, so also need to objectively determine their own eye degree.