Apparatus for examining gaze shift in depth direction

Details Apparatus for examining gaze shift in depth direction Apparatus for examining gaze shift in depth direction

1993-03-16

1995-01-17

Bertsch, Richard A.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351210, 351211, 351221, A61B 310, A61B 314

Patent

active

053829891

ABSTRACT:
In an apparatus for examining gaze shift in depth direction, light emitting diodes B and E, or D and C are lit at a plurality of positions with different distance in depth direction from the subject, and eye movement of the subject at that time is detected by an eye movement detecting portion. The signal of detection is processed in a signal processing circuit and is applied to a calculating portion. The calculating portion determines whether or not there is a disorder in gaze shift in depth direction of the subject by using any or all of latency in eye movement, time constant, amplitude, change in convergence angle, number of occurrence of saccade, and asymmetry of left and right eye movements, in response to the detected output of the eye movement.

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M. Yamada et al. "Development of an Eye-Movement Analyser Possessing Functions for Wireless Transmission and Autocalibration" Medical and Biological Engineering and Computing, Jul. 1990, pp. 317-324.

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