US PATENT SUBCLASS 351 / 222
.~ Subjective type

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.~ Subjective type {7}
223  DF  .~.~> Self examining type
224  DF  .~.~> Perimeter type {2}
227  DF  .~.~> Including trial frame {4}
232  DF  .~.~> With light polarzing lens
233  DF  .~.~> Lens or filter selectively insertable in optical path {2}
237  DF  .~.~> Including target image projection {1}
239  DF  .~.~> Including test chart or target {5}

DEFINITION

Classification: 351/222

Subjective type:

(under subclass 200) Subject matter including instruments through which the patient views a test object (target) or the test object so viewed, for detecting various ocular characteristics or deficiencies of the patient or for prescribing necessary corrections for the patient's vision based on the patient's perceptions or responses.

(1) Note. The above instruments may be permanent or nonportable installations in the office of an examining physician, or may be portable and conveniently carried units.

SEE OR SEARCH THIS CLASS, SUBCLASS:

239, including test chart or target.

244, for test instrument supports.

SEE OR SEARCH CLASS

600, Surgery,

300+, for diagnostic instruments generally.