Dapiprazole hydrochloride is primarily used in ophthalmology as a miotic agent to reverse the effects of mydriasis (pupil dilation) induced by drugs like phenylephrine or tropicamide. It is applied as an eye drop and works by blocking alpha-adrenergic receptors, leading to the constriction of the pupil and reduction of intraocular pressure. This makes it valuable in post-operative care or diagnostic procedures where rapid reversal of pupil dilation is required. Additionally, it is sometimes used to manage conditions like glaucoma by aiding in the regulation of intraocular pressure. Its application ensures patient comfort and safety by restoring normal pupil size and function.