Method and apparatus for measuring blood oxygen levels in selected areas of the eye fundus
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United States of America Patent
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Oct 31, 1989
Issued Date -
N/A
app pub date -
Aug 22, 1988
filing date -
Apr 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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