Abnormal optic nerve morphology Marcus Gunn pupil 2012-11-18T12:14:22Z HP:0200057 Relative afferent pupillary defect UMLS:C0549122 SNOMEDCT_US:247015002 SNOMEDCT_US:232122003 An aberrant pupillary response characterized by (i) Constriction of pupils of both eyes when the light stimulus is applied to the normal eye, and (ii) Dilatation of pupils of both eyes when the light stimulus is rapidly transferred from the normal eye (after brief light exposure to the normal eye) to the affected eye. Relative afferent pupil defect