Geometrical instruments – Miscellaneous – Light direction
Patent
1991-12-18
1993-02-09
Will, Thomas B.
Geometrical instruments
Miscellaneous
Light direction
33507, 351247, G01B 524, A61B 300
Patent
active
051844052
ABSTRACT:
A device having a single protractor scale for determining a therapeutic axis for toric contact lenses based on a prescription axis. The device comprising a coaxially mounted card, protractor dial and reference symbol. Alternate embodiments if the invention are set forth, depending on the specific embodiment the protractor scale may be depicted in a counter-clockwise or clockwise orientation. Additionally, methods for employing alternate embodiments of the present invention are set forth.
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