In clinical practice, we often encounter parents who refuse to dilate their children’s pupils for fear that it will harm their eyes. In fact, dilated optometry is very important for children and adolescents. Why do you say that? Children and adolescents have strong crystalline adjustment capabilities and large adjustment ranges, so it is difficult to relax the adjustment in a short period of time during optometry. For this reason, pupil dilating medications are used to relax the ciliary muscle to achieve relaxation and make the optometry results accurate and reliable. If the pupil is not dilated, it is very likely that the child will have mild myopia, but the test will show moderate myopia. Therefore, pupil dilation is necessary for children and adolescents. Dilated pupils are usually used in clinical practice for children under 12 years of age. The pupil medication can cause temporary photophobia and blurred vision, but the child will recover after a period of time, and even if the pupil is dilated several times, it will not cause harm to the eyes. Therefore, parents can relax.