MONITORING DEVICES

A method and apparatus for measuring a subject's visual field by presenting a target consisting of a spot of light at a series of selected locations within the subject's visual field and monitoring and interpreting his resulting eye movements and positions. The technique makes use of the tendency of the subject's eyes to respond to the sudden appearance of the dot of light by fixating on that target within a relatively short time after the target has been presented to him. The apparatus employed to measure the subject's visual field includes a projector which presents the light-dot targets in a known sequence on a screen before the subject, and simultaneously makes a permanent photographic image of those light-dot targets which the subject sees as determined by the eye movement monitor and its associated logic circuitry. The permanent photograph shows the viewed light dots seen by the subject in substantially the same general arrangement as presented to him. The voids of the photograph represent those points not seen by the subject and thus map his blind spots. Alternatively, a photographic image of those light-dot targets which the subject was unable to see also may be made to provide a complementary representation of the subject's blind spots.