US PATENT SUBCLASS 351 / 176
.~.~ Focus and/or astigmatism correction

Current as of: June, 1999
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351 /   HD   OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING

41  DF  SPECTACLES AND EYEGLASSES {29}
159  DF  .~ Ophtahalmic lenses or blanks {10}
176.~.~ Focus and/or astigmatism correction

DEFINITION

Classification: 351/176

(under subclass 159) Subject matter wherein one of the lens surfaces has a spherical curvature providing dioptrics or lens powers for correction of focal errors of the eye and/or wherein one lens curvature may be in cylindrical or toric form to compensate for astigmatic errors of the eye.

SEE OR SEARCH THIS CLASS, SUBCLASS:

200+, for eye testing instruments with cylindrical lens systems.