Relative Afferent Pupillary Defect This maneuver of intermittent light stimulus is called the alternating light test or "swinging-flashlight test". This phenomenon of pupillary dilation that occurs instead of contraction to the light stimulus, is called Marcus Gunn's pupils or relative afferent pupillary defect (RAPD). It is a clear sign of unilateral anomaly in the afferent path of the pupillary reflex. A very sensitive diagnostic test, but not specific regarding the cause of the afferent pathway injury. Dr. Felipe Duarte Augusto @semiologianeurologica #RAPD #Relative #Afferent #Pupillary #Defect #Neurology #Clinical #Video #Pupils #MacrusGunn #PhysicalExam
