Clinically, children under 12 years of age who undergo rapid pupil dilation the next day tend to have lower myopia than before dilation, while adolescents and adults who undergo rapid pupil dilation the next day tend to have little difference in myopia compared to before dilation. After local dilation of the eye, the drug can paralyze the ciliary muscle, relieve the eye muscle spasm caused by overuse of the eye, accordingly, the number of false myopia will be reduced or even disappear. Because children’s ciliary muscles are more prone to spasm, they are prone to pseudomyopia. Adolescents and adults, on the other hand, have relatively poorer ciliary muscle regulation and tend to be free of pseudomyopia. It is necessary to have an optometric examination to clarify the specific situation.