Computerized binocular pupillography of the swinging flashlight test detects afferent pupillary defects.

Purpose: To investigate the ability of a portable pupillometer, capable of 20-second binocular recordings of the swinging flashlight test (SFT), to detect relative afferent pupillary defects (rAPDs).

Methods: Pupillary response curves were recorded from both eyes in healthy volunteers (n = 22) with and without simulated rAPDs (using neutral density filters (NDFs)) and in abnormal patients (n = 24) with clinically graded rAPDs. The light stimulus (0.