Objective refractometers

Details Objective refractometers Objective refractometers

1981-07-06

1984-04-24

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, A61B 310

Patent

active

044444761

ABSTRACT:
An objective refractometer which enables a doctor to visually conduct optical pointings by projecting onto the retina of a patient an image coming from at least one point light source. The image is projected along an image projection path and observed through an observation path. A stand supporting the refractometer has stationary objective lenses mounted thereon while a movable unit carries an eyepiece and other apparatus which augment the projection and observation paths. An electronic control means comprising a microprocessor is operatively associated with a linear displacement detector, which detects movement of said movable unit relative to the stand, and an angular displacement detector, which detects angular rotation of test patterns on the optical axes of said projection and/or observation paths, as well as apparatus for operator controlled transmission of information derived from the detectors.

REFERENCES:
patent: 3874774 (1975-04-01), Humphrey
patent: 3927933 (1975-12-01), Humphrey

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