Optical system for light measurement of an eye fund

Details Optical system for light measurement of an eye fund Optical system for light measurement of an eye fund

1979-05-07

1981-03-03

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

128666, 128687, 128745, 351 6, A61B 310

Patent

active

042537444

ABSTRACT:
In a light measuring optical system for use in measurement of pulse waves in the artery at the eye fundus or oxygen saturation in the artery blood at the eye fundus, light for illuminating the eye fundus is converged on the surface of the cornea of the eye to be measured and enters the interior of the eye through a small area within the pupil. Light reflected at the surface of the cornea is converged and blocked at its converging position while the light reflected from the eye fundus is allowed to pass by the light blocking member and reach a photocell. Coupled with the photocell is an electric circuit which transmits AC component of photocell output when DC component of the same assumes its minimum value.

REFERENCES:
patent: 3893447 (1975-07-01), Hochheimer et al.
patent: 4157708 (1979-06-01), Imura
Laing et al., "The Choroidal Eye Oximeter: An Instrument for Measuring Oxygen Saturation of Choroidal Blood In Vivo", IEEE Transactions on Biomedical Engineering, vol. BME-22, No. 3, pp. 183-195.

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