US PATENT SUBCLASS 351 / 217
.~.~.~ On rotary disc

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}
216  DF  .~.~ Including lens selectively insertable in optical path {1}
217.~.~.~ On rotary disc {1}
218  DF  .~.~.~.~> Hand held type

DEFINITION

Classification: 351/217

On rotary disc:

(under subclass 216) Subject matter wherein multiple test lenses are eccentrically mounted on either a single rotary disc or a pair of rotary discs.

(1) Note. The lens discs in this generic subclass are used in monocular or binocular test instruments which are usually permanently mounted in the office of the oculist. Plural superimposed discs used in the instrument are mounted for rotation about a common axis so as to successively align the test lenses with coaxial sight openings in the discs.

SEE OR SEARCH THIS CLASS, SUBCLASS:

234, for subjective testing instruments with the lenses mounted on rotatable disc.