Arrangement for test image rotation in refractometers

Details Arrangement for test image rotation in refractometers Arrangement for test image rotation in refractometers

1980-07-14

1983-10-18

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, A61B 310

Patent

active

044102437

ABSTRACT:
The invention relates to an arrangement for rotating test images in refractometers for physical determination of defects of sight of a patient's eye. The arrangement is based upon the coincidence principle and has a folded path of beams to obtain a compact construction. The test images and the Scheiner apertures are mounted in rotatable sleeves (mounts) and each rotation of the sleeve of the test image is transferred to the sleeve of the Scheiner apertures by respective gear means, thus a test mark offered to a patient's eye is simultaneously rotated with the Scheiner apertures. In this manner an easy handling of the refractometer at a high precision is ensured.

REFERENCES:
patent: 4125320 (1978-11-01), Rassow et al.

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