Cyclodrine hydrochloride is primarily used in ophthalmology as a cycloplegic and mydriatic agent. It helps in dilating the pupil and temporarily paralyzing the eye's focusing muscles, which is essential during eye examinations to obtain accurate refractive error measurements. It is also utilized in certain diagnostic procedures to examine the retina and other internal structures of the eye. Additionally, it may be employed in the treatment of inflammatory eye conditions to prevent adhesions between the iris and the lens. Its fast-acting properties make it a reliable choice for short-term diagnostic and therapeutic applications in eye care.