reflexive behavior cranial nerve related reflex pupillary light reflex behavior_ontology pupillary reflex 2011-04-06T04:28:58Z "A reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the retina of the eye, thereby assisting in adaptation to various levels of darkness and light, in addition to retinal sensitivity." [wikipedia:Pupillary_light_reflex] George Gkoutos