Indirect Pupillary Light Reflex. A bright focal light is directed into each pupil toward the temporal retina and the pupil is observed for immediate constriction. A greater intensity of light causes the pupil to constrict whereas a lower intensity of light causes the pupil to dilate.
The pupillary light reflex 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. Normal pupil functions. A greater intensity of light causes the pupil to constrict whereas a lower intensity of light causes the pupil to dilate.
Impaired pupillary light reflex.
Pharmacological constriction constricting drops. The pupillary light reflex plr is the constriction of the pupil that is elicited by an increase in illumination of the retina. That eye s reflex is the direct plr. While there are other reasons for variation in pupillary dilation and constriction such as arousal leading to changes in the balance of the sympathetic and parasympathetic nervous systems here we will focus on its relation to light exposure.
