Two-dimensional eye movement monitor for clinical and laboratory recordings

A photo-electric device designed to monitor simultaneously vertical and horizontal eye movements within a 20 degrees range is presented with illustrating experimental data. Four small infrared detecting cells are mounted on a light spectacle-like frame together with a miniature true infrared (9000 A) emitting diode. This original design which eliminates separate source illumination artifacts is extremely light, preserves maximum vision field size, and has particularly straightforward operation. The instrument resolution is less than 1 minute of arc with a 1000 c/sec bandwidth and a 5% linearity over the maximum operating range.