It takes about 6 hours to 4 weeks for children to see light normally after dilating their pupils, and the specific time of seeing light is affected by the way of dilating the pupils, recovery situation and other factors. 1. Pupil dilation: Dilated pupils can be divided into rapid dilation and slow dilation, of which children over 12 years old usually use slow dilation, the duration of its effect is relatively long, it may take 2 to 4 weeks to see the light. For children over 12 years old, the duration of the medication is relatively short if it is used to dilate the pupils quickly, and it takes about 6 to 8 hours to see light. 2. Recovery: Children’s physical quality varies, and their recovery after dilation also varies. Usually, if the physical quality is good, good eye care after dilating the pupil, its visible light time is relatively early. If the child is not in good health or does not take good care of the eyes after dilating the pupils, the time to see light is relatively late. It is recommended that children follow the doctor’s instructions for care after dilation, and consult a doctor when discomfort occurs.