Ophthalmic instrument having a cross cylinder lens

Details Ophthalmic instrument having a cross cylinder lens Ophthalmic instrument having a cross cylinder lens

1982-02-11

1984-03-13

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351235, A61B 302

Patent

active

044363907

ABSTRACT:
An ophthalmic instrument having a cylindrical test lens and a cross cylinder lens which are adapted to be placed in an examining optical path. The cross cylinder lens is mounted on a lens tube which is rotatably mounted on a swingable lever about a pivot axis. A gear train is provided between the lens tube for the cross cylinder lens and a rotatable part for rotating the cylindrical test lens so that the cylinder axis of the cylindrical lens be rotated about the optical axis of the examining optical path by rotating the lens tube.

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

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