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Direct And Indirect Pupillary Light Reflex

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Direct And Indirect Pupillary Light Reflex. The pupillary light reflex plr is the constriction of the pupil that is elicited by an increase in illumination of the retina. The plrl was measured at both photopic and scotopic illuminance level using an infrared lig.

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The direct plr present in virtually all vertebrates is the constriction of the pupil in the same eye as that stimulated with light. A greater intensity of light causes the pupil to constrict miosis myosis. The pupillary light reflex plr or photopupillary reflex is a reflex that controls the diameter of the pupil in response to the intensity of light that falls on the retinal ganglion cells of the retina in the back of the eye thereby assisting in adaptation of vision to various levels of lightness darkness.

The direct plr present in virtually all vertebrates is the constriction of the pupil in the same eye as that stimulated with light.

A greater intensity of light causes the pupil to constrict miosis myosis. Stimulation of the contralateral cn iii parasympathetic nucleus results in this diagram from optic nerve transmission which does not cross over at the optic chiasm 25 in the dog but does. An rapd is diagnosed by observing paradoxical dilatation when light is directly shone in the affected pupil after being shown in the healthy pupild to be from a pathologic process. The plrl was measured at both photopic and scotopic illuminance level using an infrared lig.

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