Tropicamide eye drops recover after 4-6 hours. Tropicamide eye drops are a short-acting pupil dilator and are commonly used clinically for dilated optometry in children under 18 years of age, through which the pupil can be dilated to paralyze the ciliary muscle, reduce the adjustment force, obtain accurate optometry results, and fit the appropriate glasses. In addition, tropicamide eye drops are also commonly used for iridocyclitis. Tropicamide can move the pupil, reduce the inflammatory response, alleviate the symptoms of ocular congestion, reduce pain, and prevent the occurrence of post-iris adhesions. Within 4-6 hours of the action of tropicamide, the eyes will not open under strong light, and reading books and cell phones at close range will be blurred. After 4-6 hours, the pupil will naturally return to normal size and all eye symptoms will disappear.