The purpose of astigmatism is to paralyze the ciliary muscle and obtain an accurate refractive error by objective photometry in a relaxed state of adjustment. Tension in the ciliary muscle causes the lens to become more convex and refractive, resulting in pseudo-myopia. This shows that for some adolescents, dilated pupils are necessary. The doctor or optometrist will choose the type of pupil dilatation that is appropriate for your teenager’s condition. Dilating medication paralyzes the ciliary muscle while also acting on the pupillary sphincter, which has the effect of dilating the pupil. Not only will myopia be blurred, but photophobia will also occur after the pupil is dilated. Therefore, you should avoid activities in bright light or using your eyes at close range (reading a book, looking at a computer, etc.). After examination, dilated pupils are generally not harmful to the eyes. For compound tropicamide eye drops (fast pupil dilator), the pupil recovery time is 6-8 hours; for 1% atropine eye gel (slow pupil dilator), the pupil recovery time is 21 days. 1% atropine pupil dilator, possible side effects include flushing of the face, thirst, low grade fever, etc. The symptoms are mild, drink more water, and will disappear after stopping the medication; if stronger reactions such as high fever occur, please Stop the medication immediately or consult an ophthalmologist.