Device for detecting blinking of an eye under examination

Details Device for detecting blinking of an eye under examination Device for detecting blinking of an eye under examination

1981-05-01

1984-12-04

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314, G03B 2900

Patent

active

044860803

ABSTRACT:
An opthalmological instrument including a blinking detecting device for positively detecting when an eye is blinking to thereby eliminate errors in optical measurements due to variations in the signal light produced by the blinking. An optical system receives light beams reflected from a portion of an eye under examination to form an image of the front portion of the eye in an image plane. An image pickup element is disposed at the image plane and produces an output video signal in response thereto. A detecting circuit which receives the video signal determines whether or not the image pickup element exceeds a predetermined threshold value. If the threshold value is not exceeded, an indication is produced that blinking has occurred.

REFERENCES:
patent: 3802768 (1974-04-01), Robinson et al.
patent: 3880501 (1975-04-01), Munnerlyn
patent: 4149787 (1979-04-01), Kobayashi

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