Optical system for objective eye-examination

Details Optical system for objective eye-examination Optical system for objective eye-examination

1978-03-09

1979-11-06

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

250200, 351 13, 351 14, 351 15, 356126, 356128, A61B 310

Patent

active

041733983

ABSTRACT:
An objective eye examination apparatus generates rotating pencil rays of infrared light and focuses one of them on the eye pupil via an adjustable wedge reflector 55, 57 for varying the effective length of the optical axis. Light reflected back by the retina and returned into the optical system is passed through an image rotator 41 onto a quadrant photocell 43. The wedge reflector is adjusted until the differential outputs from the photocell reach a desired value, whereby the necessary reflector adjustment is indicative of refractive power. Unfocusable fogging light is also introduced into the eye via a dichroic mirror 39, and a further photocell 35 is disposed to receive light reflected back from the cornea only when the eye is properly positioned and open.

REFERENCES:
patent: 3602580 (1971-08-01), Samuels
patent: 3819256 (1974-06-01), Bellows et al.
patent: 4021102 (1977-05-01), Iizuka
F. W. Campbell et al., "High Speed Infrared Optometry," JOSA, vol. 49, No. 3, pp. 268-272, Mar. 1959.

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