Eye testing and training apparatus incorporating optical projector and relatively rotatable target templates

Claim 1

A VISION TESTING AND TRAINING APPARATUS COMPRISING A LIGHT PROJECTION UNIT INCLUDING AN UPWARDLY DIRECTED LIGHT SOURCE AND OPTICAL MEANS FOR PROJECTING LIGHT FROM SAID LIGHT SOURCE UPON A VIEWING SURFACE, A PAIR OF IMAGE-PRODUCING TEMPLATES BEING OPAQUE TO LIGHT AND HAVING LIGHTTRANSMITTING PATTERNS FORMED ON EACH TEMPLATE, MEANS FOR SUPPORTING SAID TEMPLATES FOR INDEPENDENT ROTATION TRANSVERSELY ACROSS AND IN CENTERED RELATION TO THE PATH OF LIGHT FROM SAID LIGHT SOURCE AND IN SUPERIMPOSED RELATION TO ONE ANOTHER, SAID SUPPORTING MEANS INCLUDING A VERTICAL STEPPED SPINDLE CENTERED WITH SAID LIGHT SOURCE AND A PAIR OF HORIZONTALLY DISPOSED TRANSPARENT PLATFORMS REMOVABLY AND ROTATABLY MOUNTED ON THE STEPPED PORTIONS OF SAID SPINDLE FOR SUPPORTING THE RESPECTIVE TEMPLATES, SAID LIGHT-TRANSMITTING PATTERNS COOPERATING TO PRODUCE A LIGHT IMAGE UPON THE VIEWING SURFACE BY RESTRICTING THE PASSAGE OF LIGHT FROM SAID LIGHT SOURCE THROUGH INTERSECTING LIGHT-TRANSMITTING PATTERNS ONE OF SAID PLATFORMS BEING MANUALLY ADJUSTABLE, AND MOTOR DRIVE MEANS, INCLUDING SPEED CONTROL MEANS, ENGAGEABLE WITH THE OTHER PLATFORM TO ROTATE ONE TEMPLATE WITH RESPECT TO THE OTHER TEMPLATE TO SELECTIVELY AND SUCCESSIVELY VARY THE POINTS OF INTERSECTION OF SAID LIGHT-TRANSMITTING PATTERNS WHEREBY TO VARY THE LOCATION AND CHARACTER OF LIGHT IMAGES PRODUCED UPON THE VIEWING SURFACE.