Atropine theraupetic effect a. Ophthalmic:

In the eye, topical atropine exerts both mydriatic and cycloplegic effects, and it permits the measurement of refractive errors without interference by the accommodative capacity of the eye. [Note: Phenylephrine or similar α-adrenergic drugs are preferred for pupillary dilation if cycloplegia is not required]. Shorter-acting antimuscarinics (cyclopentolate and tropicamide) have largely replaced atropine due to the prolonged mydriasis observed with atropine (7–14 days versus 6–24 hours with other agents). Atropine may induce an acute attack of eye pain due to sudden increases in eye pressure in individuals with narrow-angle glaucoma.