Many people think that it is enough to choose good quality orbits and lenses for teenagers’ myopia without going to the hospital. However, in reality, because the ciliary muscle of the adolescent eye has a strong regulating power, it is necessary to go through a strict dilated eye exam to get the correct prescription. The role of dilated pupils in children: Dilated pupils are used to completely paralyze the ciliary muscle of the eye with medication, causing it to lose its regulating effect. This is mainly because of the strong regulation of the eyes of adolescents, and if the pupil is not dilated during optometry, the regulatory myopia component, known as pseudomyopia, cannot be removed, and the accuracy of the results is affected. The method of dilated optometry: 1. Long-acting dilator: apply atropine eye ointment to the eye twice a day for 3-5 days, optometry on the 4th day, and try glasses after 3-4 weeks; 2. Short-acting dilator: use tropine amide eye drops to spot the eye once every 5 minutes for 5 times, optometry after 20 minutes, and try glasses after the 2nd day. Normal signs after pupil dilatation: difficulty seeing things (especially near things), photophobia (strong light). These are temporary, and it usually takes about 3 weeks for symptoms to disappear with atropine, and about 6-8 hours with tropicamide.