US PATENT SUBCLASS 351 / 239
.~.~ Including test chart or target

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}
239.~.~ Including test chart or target {5}
240  DF  .~.~.~> Stereoscopic type
241  DF  .~.~.~> Astigmatism type
242  DF  .~.~.~> Chromaticity type
243  DF  .~.~.~> Illuminated
244  DF  .~.~.~> Having support or cabinet

DEFINITION

Classification: 351/239

Including test chart or target:

(under subclass 222) Subject matter including charts with movable or stationary patterns or targets for either direct reading, or in relation with an optical instrument for testing or otherwise determining visual acuity or errors of refraction of the eye.

SEE OR SEARCH THIS CLASS, SUBCLASS:

211, for objective eye testing which involves projecting a chart or target into the eye.

237, for target projection.

SEE OR SEARCH CLASS

600, Surgery,

300+, for diagnostic instruments.

606, Surgery, 204.25, for eye orthopedics.