The afferent or sensory limb of the pupillary light reflex is CN2 while the efferent or motor limb is the parasympathetics of CN3. Shine a flashlight into each eye noting the direct as well as the consensual constriction of the pupils. The swinging flashlight test is used to test for a relative afferent pupillary defect or a Marcus Gunn pupil. Swinging the flashlight back and forth between the two eyes identifies if one pupil has less light perception than the other. Shine the flashlight at one eye noting the size of both pupils. Then swing the flashlight to the other eye. If both pupils now dilate then that eye has perceived less light stimulus (a defect in the sensory or afferent pathway) than the opposite eye.
From the NeuroLogic Exam: An Anatomical Approach collection of the Health Education Assets Library (HEAL) http://www.healcentral.org.
Copyright The University of Utah 2001; Updated Jan 2004; Updated June 2004; Updated July 2005.
The videos are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License (http://creativecommons.org/licenses/by-nc-nd/2.5/).The afferent or sensory limb of the pupillary light reflex is CN2 while the efferent or motor limb is the parasympathetics of CN3. Shine a f...all »The afferent or sensory limb of the pupillary light reflex is CN2 while the efferent or motor limb is the parasympathetics of CN3. Shine a flashlight into each eye noting the direct as well as the consensual constriction of the pupils. The swinging flashlight test is used to test for a relative afferent pupillary defect or a Marcus Gunn pupil. Swinging the flashlight back and forth between the two eyes identifies if one pupil has less light perception than the other. Shine the flashlight at one eye noting the size of both pupils. Then swing the flashlight to the other eye. If both pupils now dilate then that eye has perceived less light stimulus (a defect in the sensory or afferent pathway) than the opposite eye.
From the NeuroLogic Exam: An Anatomical Approach collection of the Health Education Assets Library (HEAL) http://www.healcentral.org.
Copyright The University of Utah 2001; Updated Jan 2004; Updated June 2004; Updated July 2005.
The videos are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License (http://creativecommons.org/licenses/by-nc-nd/2.5/).«
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