Eye fundus plethysmograph assembly

Details Eye fundus plethysmograph assembly Eye fundus plethysmograph assembly

1976-10-22

1979-06-12

Michell, Robert W.

Surgery

Truss

Pad

A61B 502

Patent

active

041577086

ABSTRACT:
An eye fundus plethysmograph assembly is provided for determining variations in the amount of blood present at the fundus of the eye. A source of at least a first and second wavelength of light energy is specifically directed into a subject eye for reflection from the retina or fundus of the eye. The reflected light is directed at a receiving element that can produce a first output signal representative of a reflected first wavelength and a second output signal representative of a reflected second wavelength. A processing circuit is provided for subtracting one of the first and second output signals from the other to provide a representative measurement output of the amount of blood in the blood vessels adjacent the eye fundus. The output signals can be recorded or displayed in any desired form to facilitate the interpretation of the amount of blood present.

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