Eye movements measured with a solid state photodiode matrix

The apparatus described uses the corneal reflex technique to measure horizontal and vertical eye movements with a metal oxide semiconductor matrix array of 64 by 64 photodiodes. A simple optical system forms a reflex image on the array and also determines the device range, which can vary from ±25 deg to ±3 deg; sensitivity is 50 arc min and 6 arc min, respectively. Mounted on a simple lightweight headband complete with universal mechanical adjusters, the instrument weighs less than 100 g, excluding connecting cable, and samples eye movements every 5 msec.