Eye refractmeters using infrared rays

Details Eye refractmeters using infrared rays Eye refractmeters using infrared rays

1979-11-09

1981-12-22

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 14, A61B 310

Patent

active

043067786

ABSTRACT:
Eye refractmeter using infrared rays in which the target projecting optical system includes an aperture disc having a semicircular apertures disposed within a circle corresponding to the pupil of the patient's eye with chord portions thereof opposed to each other with a spacing therebetween. The observing optical system includes a disc having a slot located at a position corresponding to the space between the apertures. The apertures and the slots are located in conjugate with the patient's pupil with respect to the objective lens.

REFERENCES:
patent: 3871772 (1975-03-01), Munnerlyn et al.
patent: 4021102 (1977-05-01), Iizuka

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