Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1988-08-22
1989-10-31
Dzierzynski, P. M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
128633, A61B 310, A61B 500
Patent
active
048773220
ABSTRACT:
This invention provides for the measurement of relative oxygen saturation of the choriodal blood of the fundus of the eye of a subject by directing into the eye a source beam of light including incandescent, red and infrared light, the combined beam penetrating the choroid and impinging on the sclera of the eye, the beam then being reflected back out of the eye as a collimated beam of light. The collimated beam of light is directed to a dichroic beam splitter where the red and infrared light are separated from the beam and are subject to the measurement of their respective intensities. The measured intensities of the red and infrared light components of the collimated beam reflected from the eye are compared with the measured intensities of the red and infrared light components of the separated portion of the source beam of light to determine the ratio of oxyhemoglobin to reduced hemoglobin.
REFERENCES:
patent: 4305398 (1981-12-01), Sawa
patent: 4485820 (1984-12-01), Flower
Laing, R. A. et al, I.E.E.E. Trans. on Biomed. Engng., vol.-BME 22, No. 3, pp. 183-195, May 1975.
Dzierzynski P. M.
Eyedentify, Inc.
Farley Eugene D.
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