Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1988-12-19
1990-05-22
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351200, 351246, A61B 302
Patent
active
049272594
ABSTRACT:
An apparatus and method for testing the visual field of a person is provided in which the apparatus comprises light point sources distributed over the visual field of the person being examined, an input device for accepting patient responses, and a control unit that allows the points of light to light up in logarithmically graduated intensity based on the patient responses. The person being examined inputs the answer "seen" or "not sheen" into the input means which relays such information to the control unit. The control unit responds accordingly and cycles the phase intensity of the light point sources through a measurement cycle having both an increasing intensity phase and a decreasing intensity phase thereby allowing a determination of the minimum threshold at which the patient can detect the points of light within his field of vision.
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