Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1989-03-22
1990-09-04
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351237, 128731, 128745, A61B 310
Patent
active
049539680
ABSTRACT:
An automated visual testing system is disclosed which presents an alternating steady state visual stimulus to a patient through an optical system that modifies the stimulus image. As the image changes, the patient produces evoked potentials that change. The evoked potentials are detected by a product detector which produces the amplitude of the evoked potentials. The amplitude is monitored through an analog to digital converter by a supervisor computer. The supervisor computer produces patient response curves from which it diagnoses visual system malfunction and/or prescribes correction. A control processor controls a stimulus generator to produce the image and an optical system, that includes polarizers, an astigmatism test slit or a cylindrical lens, a zoom lens system and a variable focal length test lens, transmits the image to the patient. The steady state visual potential stimulus generator is a device by which a rapidly complementing or flashing pattern can be presented to the patient. The generator allows the contrast of the image to be varied without varying luminance and allows operation in a true bicolor and multicolor mode. The product detector detects the level of the steady state evoked potential signals even in the presence of substantial background noise and extraneous electroencephalographic signals. These detectors can be used to monitor the evoked potential produced by visual, all or somatic steady state stimuli.
REFERENCES:
patent: 4697598 (1987-10-01), Bernard et al.
patent: 4832480 (1989-05-01), Kornacker et al.
Hanes Lewis F.
Schmidt Albert L.
Sherwin Gary W.
Bovernick Rodney B.
Ryan Jay
Westinghouse Electric Corp.
Williamson J. K.
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