The refractive sphere S and refractive column C parameters are 0 or less than 50 diopters for normal adults, and younger children may have some reserve of positive hyperopia. The reference value of refractive sphere S is somewhat different for different ages. Since the visual acuity of younger children is still in the process of development of the eye axis, there is a state of hyperopia that becomes smaller and smaller with the progress of age, which is normal for a lower positive value of refractive sphere S. In adults, it is 0 or less than 50 diopters. And in adulthood, it is 0 degrees or less than 50 degrees. Refractive column C refers to the presence of uneven distribution of refractive status, its reference value is generally 0 degrees and the reference value does not have age differences, refractive column C and refractive spherical lens S value exceeds the normal limit resulting in the impact on vision should be corrected in a timely manner.