Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1990-05-21
1992-06-09
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351234, A61B 302
Patent
active
051201240
ABSTRACT:
Apparatus and techniques for measuring and determining the crossed cylinder powers and axes obtained through independent rotation of cylinder lenses are disclosed. Degree scales associated with each lens provide angular measurements for use in connection with a chart or similar apparatus, and in some embodiments determination of the resulting crossed cylinder powers and angles made be made directly from markings included on alternatively designed scales. Unlike many other refractive devices, however, which require use of a digital computer to determine the resulting crossed cylinder power and axis of multiple lenses, the present invention allows such a determination to be made merely by manipulating the positions of the lenses (and viewing entries on the chart as appropriate) and performing simple mathematical operations on the values obtained.
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