Atropine sulfate eye drops is one of the commonly used drugs in ophthalmology, and its main effects are shown in the following aspects. First, it has a pupil-dilating effect and is mainly used to treat iridocyclitis. Patients with iridocyclitis are prone to pupillary atresia and pupillary membrane closure, which can lead to secondary glaucoma and cause serious harm. Therefore, atropine sulfate drops are needed to dilate the pupil and prevent adhesions. For patients who have already developed adhesions, the adhesions can also be pulled apart. Second, it has the effect of paralyzing the ciliary muscle and is mainly used for optometry. Usually, in children, the ciliary muscle is in a constant state of adjustment and spasm, resulting in inaccurate optometry. Sometimes the error can reach 200-300 degrees or more, so it is necessary to use atropine drops to completely paralyze the ciliary muscle before the optometry is done to get the accurate prescription.