Atropine eye drops, is one of the more potent pupil-dilating medications. The main effect of atropine eye drops is to dilate the pupils and paralyze the ciliary muscles. The active ingredient of this drug is atropine, which is an M cholinergic receptor blocker that blocks M cholinergic receptors in the tissues of the eye, causing pupil dilation and ciliary muscle paralysis. Clinically, it can be used primarily for iridocyclitis to prevent adhesions. It can also be used to dilate the pupil before examining the fundus, and can also be used to paralyze the ciliary muscle regulation during optometry, dispensing, and refractive error testing. This drug should be used rationally under the guidance of a doctor.