Pupillary Light Reflex Check this reflex in a classmate by using a pen light moving laterally then medially towards each eye, observing changes in the size of each pupil as light enters the eye. Allow a minute or so for your classmate to adjust to normal light, then check each eye again, but this time quickly make your observation at one eye then quickly move over to the opposite eye across the nose, and note pupillary size or changes in size. What it the pupillary response? What is the function of the contralateral and/or ipsilateral response?

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