US PATENT SUBCLASS 351 / 213
.~.~ Including light filter or absorber

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

200  DF  EYE EXAMINING OR TESTING INSTRUMENT {7}
205  DF  .~ Objective type {10}
213.~.~ Including light filter or absorber

DEFINITION

Classification: 351/213

Including light filter or absorber:

(under subclass 205) Subject matter including a filter or

absorber wherein a light beam directed into a patient's eye is of a specific color or wave length, or wherein the luminous intensity of the light is weakened to a desired magnitude by appropriate absorbers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

233, for movable lens or filter selectively insertable in optical path.