In the event of vision problems generally need to be optometrist, optometry can more accurately detect the degree of the eye and related parameters, optometry will usually appear in several information, R for the right eye, L for the left eye, S spherical lens shows the degree of myopia or hyperopia, C column lens indicates the degree of astigmatism, A axial represents the direction of astigmatism, PD represents the pupillary distance. Through the S, A, C value of the test can see the degree of the eye value, the degree of d to express, for example, the optometry list appears on the spherical lens S degree +1.00dS-R means 100 degrees of farsightedness in the right eye, if it is -1.00DS-L means 100 degrees of nearsightedness in the left eye, A value of 150 represents astigmatism axial to 150 °, C value -0.25 represents astigmatism 25 degrees, through these optometry list on the Through the data on these optometry sheets, the examinee can have a clearer understanding of the degree of his or her eyes. However, computerized optometry can only reflect the degree of the eye, and is not used as a standard for prescription lenses, because the data on the optometry sheet has errors due to high myopia, astigmatism, and age differences, so a professional doctor or optometrist should determine the exact degree of your eyes based on the degree of the optometry sheet and other comprehensive factors.