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The pupillary light reflex (PLR) is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the retinal ganglion cells of the eye, thereby assisting in adaptation to various levels of lightness/darkness.he pupillary reflex pathway begins with the photosensitive retinal ganglion cells, which convey information to the optic nerve (via the optic disc). The optic nerve connects to the pretectal nucleus of the upper midbrain, bypassing the lateral geniculate nucleus and the primary visual cortex.
Patton. 207, The iris has two sets of. muscles: a circular or sphincter muscle, which acts to constrict the pupillary aperture, and a radial component, contraction of which dilates the pupil. Pupillary size is determined by the balanced action of these two sets of muscles.atton. 207, The iris has two sets of. muscles: a circular or sphincter muscle, which acts to constrict the pupillary aperture, and a radial component, contraction of which dilates the pupil. Pupillary size is determined by the balanced action of these two sets of muscles.