Swinging light test

Swinging light test
When light enters one eye, it is detected by retinal photoreceptors and transmitted via the optic nerve to the pretectal nucleus in the midbrain. From there, signals are sent bilaterally to the Edinger-Westphal nuclei, which send parasympathetic fibers via the oculomotor nerves to the ciliary ganglia. These fibers innervate the sphincter pupillae muscles in both eyes, causing both pupils to constrict—the direct response in the stimulated eye and the consensual response in the other eye. This bilateral response ensures equal pupillary adjustment to light
SpecialtyOphthalmology Edit this on Wikidata

The swinging-flashlight test, also known as the swinging light test, is used in medical examinations to identify a relative afferent pupillary defect.

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