US PATENT SUBCLASS 351 / 226
.~.~.~ With bowl type screen

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}
224  DF  .~.~ Perimeter type {2}
226.~.~.~ With bowl type screen

DEFINITION

Classification: 351/226

With bowl type screen:

(under subclass 224) Subject matter wherein the surface is shaped as a hollow hemispherical bowl or cup carrying inside suitable test patterns or targets which are viewed by the patient.