0.75 is just a number, if it is expressed in multiple degrees, you must add a plus sign or a minus sign, or axial to express the degree. For example -0.75DS means 75 degrees of myopia, if it is +0.75DS, it means 75 degrees of hyperopia. If it is 0.75 x 1 axial, it means astigmatism. So 0.75 only represents a number and there is no necessary connection with the degree. The refractive eye examination is mainly composed of spherical lens, column lens and astigmatism. In addition, the eye axis and corneal curvature should be checked to reflect the complete refractive status of a person, and to determine whether the refractive status is normal or abnormal, and whether it needs to be treated with lenses.