Visual acuity testing apparatus with test characters representing stylized human hand

Claim 1

IN A DEVICE FOR TESTING VISUAL ACUITY; A GENERALLY FLAT OPAQUE MEMBER HAVING AN OPENING THERETHROUGH; A TRANSLUCENT DISC PIVOTALLY MOUNTED ON ONE SIDE OF SAID MEMBER ON AN AXIS SPACED FROM SAID OPENING; A PLURALITY OF OPAQUE MEANS ON SAID DISC, EACH DEFINING A VISUAL ACUITY TEST CHARACTER, EACH TEST CHARACTER COMPRISING A STYLIZED REPRESENTATION OF A HUMAN HAND WITH THE FINGERS AND THUMB THEREOF ALL POINTING IN THE SAME GENERAL DIRECTION, THE THUMB AND LITTLE FINGER BEING OF THE SAME SIZE AND CONFIGURATION, AND HAND BEING SYMMETRICAL ABOUT A CENTER LINE EXTENDING ALONG THE MIDDLE FINGER, THE CIRCUMSCRIBING OUTLINE OF EACH REPRESENTATION BEING SUBSTANTIALLY CIRCULAR AND THE WIDTH OF THE FINGERS BEING SUBSTANTIALLY EQUAL TO THE WIDTH OF SPACES THEREBETWEEN, AT LEAST ADJACENT SAID CIRCULAR OUTLINE; EACH REPRESENTATION DIFFERING FROM CERTAIN OTHERS IN THE DIRECTION OF ORIENTATION OF THEIR FINGERS ON SAID DISC AND DIFFERING FROM THE REMAINING REPRESENTATIONS IN THE SIZE OF THEIR CIRCULAR OUTLINES; SAID CHARACTERS BEING POSITIONED ON SAID DISC TO BE SELECTIVELY VISIBLE THROUGH SAID OPENING, FROM THE OTHER SIDE OF SAID MEMBER, UPON ROTATION OF SAID DISC; AND COOPERATING INDICIA AND INDEX MEANS ON SAID ONE SIDE OF SAID MEMBER AND ON SAID DISC FOR IDENTIFYING THE PARTICULAR CHARACTER THEN VIDIBLE THROUGH THE OPENING AND THE DIRECTION OF ORIENTATION OF THE FINGERS THEREOF.