Image rotating means for eye refractometers

Details Image rotating means for eye refractometers Image rotating means for eye refractometers

1980-04-22

1983-01-04

McGraw, Vincent P.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, 351205, A61B 310

Patent

active

043670199

ABSTRACT:
Eye refractometer including a target projecting optical system for projecting a target image on the retina of a patient's eye, and an observing optical system for observing the target image. An image rotator is provided for rotating the target image to thereby locate the astigmatic axes. The image rotator is associated with a rotating mechanism which includes an actuating member for producing a stepless rotation of the image rotator and a second member for rotating the first member by an angle corresponding to a 90.degree. rotation of the target image.

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

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