efferent pupillary defect
pupillary defect, efferent
A defect of the pupillary reflex caused by a lesion along the pathway of either the parasympathetic supply from the Edinger-Westphal nucleus to the sphincter pupillae muscle of the iris (Adie's pupil), or the ocular sympathetic supply from the ciliospinal centre to the dilator pupillae muscle of the iris (Horner's syndrome). The main sign of efferent pupillary defect is non-physiological anisocoria. See pupil. Marcus Gunn; pupil light reflex.