Eye attention monitor

Details Eye attention monitor Eye attention monitor

1978-02-27

1979-10-02

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

250203R, A61B 314, G01J 120

Patent

active

041696638

ABSTRACT:
A device for monitoring eye attention along an axis includes a telescope directed toward the eye, and a four quadrant photocell detector disposed at the image plane of the telescope. The four photocell outputs are summed to produce X, Y, and common mode signals. These signals are processed to form their absolute values, and are then summed to produce a voltage proportional to deviation of the direction of the eye from the desired axis. This voltage signal is compared with a background illumination signal by an adjustable threshold detector, which actuates a Schmitt trigger to indicate deviation of the attention of the eye.

REFERENCES:
patent: 2724305 (1955-11-01), Brant
patent: 3583794 (1971-06-01), Newman
patent: 3724932 (1973-04-01), Cornsweet et al.
patent: 3864030 (1975-02-01), Cornsweet

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