Children and adolescents may have better vision after pupil dilation due to the effects of atropine, tropicamide, and other pupil-dilating medications that reduce the lens convexity relaxing the accommodation. Children and adolescents after using atropine and tropicamide and other astigmatizing drugs eye drops, so that the ciliary muscle pulling the suspensory ligament of the lens relaxes and stretches, so that the suspensory ligament of the lens is passively tightened by the lens, especially its anterior surface of the convexity decreases, and this set of actions produces the equivalent of placing a certain number of degrees of concave lens in front of the eyes, and for myopia, their eyesight will be improved. Generally speaking, for young children and adolescents, astigmatism is used to measure visual acuity. Pseudo-refractive errors of lower degrees can disappear after eliminating the influence of adjustment, while myopic refractive errors that still exist after regular astigmatism need to be dealt with accordingly.