The degree of myopia is usually seen from the optometry slip, usually DS is the degree of refractive spherical lens, and the negative value of the degree represents the degree of myopia. There are a lot of data on the optometry sheet, in which R stands for the right eye and L stands for the left eye. DS, DC, and AX stand for spherical, cylindrical, and axial, respectively. DS stands for refractive sphere, if it is then a positive value represents hyperopia and a negative value represents myopia, e.g. -2.00DS represents 200 degrees of myopia. DC represents the refractive cylinder degree, i.e., the degree of astigmatism, generally myopia will be accompanied by a certain degree of astigmatism, for example, -0.75DC means myopic astigmatism is 75 degrees. AX stands for astigmatism axis position, generally in astigmatism will be labeled after the axis position, such as 180AX, said astigmatism axis position of 180. In addition, some optometrists have PD, which stands for Pupillary Distance, i.e. the distance between the centers of the pupils of the two eyes. The specific degree of myopia to comprehensive optometry single data overall analysis, if found to have myopia to go to the hospital in time to do optometry examination, under the guidance of the doctor for prescription correction.