Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1989-02-13
1990-07-24
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351234, A61B 302
Patent
active
049431625
ABSTRACT:
A new lens system and method of use for otherwise conventional refractors comprising a five-lens, variable crossed cylinder lens attachment and selectable fixed crossed cylinders which may be placed in the examining optical path. The variable crossed cylinder lens attachment includes two pairs of counter rotating cylinder lenses, each of which may be manipulated independent of the other, and a stationary sphere lens. The assembly also is connected to a computer so that the measurement of astigmatism may be made automatically. In addition, refractive techniques utilizing the disclosed crossed cylinder lens systems are described.
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