Eye Movement and Stimulus Movement; New Photoelectric Electromechanical System for Recording and Measuring Tracking Motions of the Eye*

Abstract

A new technique of eye-movement measurement based upon a photoelectric principle is described. An image of a small portion of the eye at the juncture of the iris and sclera is cast upon a surface containing a small horizontal slit. Behind the slit is located the photocathode of a photomultiplier tube. As the eye rotates on its vertical axis more or less of the sclera (or iris) falls upon the slit, and hence more or less total light reaches the photosensitive element of the tube. The output of the tube thus can be related directly to the angular position of the eye.