US PATENT SUBCLASS 351 / 234
.~.~.~ Mounted on rotatable 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}
222  DF  .~ Subjective type {7}
233  DF  .~.~ Lens or filter selectively insertable in optical path {2}
234.~.~.~ Mounted on rotatable disc {1}
235  DF  .~.~.~.~> Having plural disc carrier

DEFINITION

Classification: 351/234

Mounted on rotatable disc:

(under subclass 233) Subject matter wherein the person undergoing eye examination views a test object through test lenses mounted in a circle on one or several rotatable discs, each lens having a different spherical, cylindrical or light absorbing power.

(1) Note. The above eye testing instruments may comprise illumination means functioning electrically in conjunction with a timing and time indicating apparatus.

SEE OR SEARCH THIS CLASS, SUBCLASS:

205, for objective testing instruments having lenses mounted on rotatable discs.

SEE OR SEARCH CLASS

353, Optics: Image Projectors, for image projectors of general utility.