The pupil can be fully recovered 6-8h after tropicamide dilatation. Tropicamide is a fast pupil dilator and is commonly used clinically in children between the ages of 10 and 18 years old for optometry to reduce the adjustment force by paralyzing the ciliary muscle and to obtain an accurate refractive error. Eye examinations also require dilated pupils, which allow the pupil to be dilated to clearly see the lesions in the fundus of the eye. In cases of iridocyclitis of the eye, the pupil is often dilated with compound tropicamide. The purpose of dilating the pupil is to reduce the inflammatory response, reduce pain, and prevent posterior adhesions of the iris by moving the pupil. It is important to press the tear sac for 2-3 min after using compound tropicamide. Also, you need to wear sunglasses when you go out, and you will be blurred when you look at your cell phone or computer.