Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1987-03-16
1989-04-11
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351235, A61B 302
Patent
active
048200409
ABSTRACT:
A new lens system and method of use for otherwise conventional refractors comprising a synchronized, variable crossed cylinder lens attachment and selectable fixed crossed cylinders which may be placed in the examining optical path. The synchronized, variable crossed cylinder lens attachment replaces the Jackson crossed cylinder lens and rotates in step with rotation of the cylinder lens axis. Batteries of strong and weak crossed cylinder lenses replace the strong and weak cylinder lenses of conventional refractors. Refractive techniques utilizing the disclosed crossed cylinder lens systems are also described.
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