cycloplegic

This term is a specialized medical descriptor used almost exclusively within ophthalmology and optometry. It describes a specific physiological state where the eye cannot focus on near objects due to the temporary paralysis of the ciliary muscle. In a clinical setting, this is typically an intentional effect induced by pharmacological agents to obtain an accurate measurement of the eye's refractive power without the interference of the patient's own focusing effort.

When used as a noun, it refers specifically to the medication itself. Practitioners distinguish between a cycloplegic and a simple mydriatic; while both may dilate the pupil, a cycloplegic specifically disables the accommodation mechanism. Because of this potent effect, these agents are often used in pediatric exams where children cannot consciously relax their focusing muscles.