The television eye marker as a recording and control mechanism.

Abstract

The Television Eye Marker utilizes the reflection of a light from the cornea to record the position of a man's gaze upon a picture of the scene at which he is looking. This corneal reflection is viewed under magnification by a television camera while the scene is viewed by a second television camera and the outputs of the two cameras are combined. The resultant picture on the monitor television screen shows the scene with a bright spot superimposed, indicating the position and movements of the subject's gaze. This can be photographed by a motion picture camera. The bright spot is called the Eye Marker. Photocells are mounted against the monitor television screen and are thus activated when the Eye Marker passes beneath them. The position of each phootocell is correlated with a position in the scene so that when the subject looks at a point in the scene, the corresponding photocell is activated. The photocell output is used to record the positions of visual fixation, and also to control the visual or other information presented to the subject. A method of converting the photocell output into signals in the teletype code is described.