Refractor cross-cylinder apparatus

Details Refractor cross-cylinder apparatus Refractor cross-cylinder apparatus

1978-02-27

1980-01-29

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 28, A61B 302

Patent

active

041858964

ABSTRACT:
A pair of cylinder lenses have a combined power of zero when their cylinder axes are parallel and a small cross cylinder power when one lens is rotated until its axis is perpendicular to the cylinder axis of the other lens. Cross-cylinder lenses are used to determine the accuracy of the cylinder power and cylinder axis selected by the practitioner. By mounting one cylinder lens in a motor-driven ring-like lens mount having a member which engages another ring-like lens mount, a single motor can be used to drive both lenses; select between parallel cylinder axes and crossed cylinder axes; and rotate the crossed axis lenses as an assembly to the desired position.

REFERENCES:
patent: 3498699 (1970-03-01), Wilkinson
patent: 3698799 (1972-10-01), Pitchford
patent: 3860330 (1975-01-01), Persson

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