Vision-testing apparatus having angularly spaced viewing paths for viewing two concentric series of testing charts

Claim 1

VISION-TESTING APPARATUS COMPRISING MEANS DEFINING STRAIGHT, ANGULARLY-SEPARATED DISTANCE AND READING VIEWING PATHS, A PLURALITY OF SUBSTANTIALLY IDENTICAL FRAMES EACH EMBODYING A PAIR OF ANGULARLY DISPOSED FRAME SECTIONS, A PLURALITY OF VISION-CHECKING MEANS MOUNTED ON RESPECTIVE SECTIONS OF SAID FRAMES AND A SINGLE CARRIER SUPPORTING SAID FRAMES IN SUBSTANTIALLY RADIALLY-EXTENDING RELATION THEREON SO THAT CORRESPONDING FRAME SECTIONS ARE DISPOSED IN CIRCUMFERENTIALLY-SPACED RELATION TO EACH OTHER AROUND SAID CARRIER, ONE SECTION FROM EACH OF SAID FRAMES BEING ARRANGED IN AN INNER CONCENTRIC SERIES AROUND THE CARRIER AND THE OTHER FRAME SECTIONS BEING ARRANGED IN AN OUTER CONCENTRIC SERIES AROUND SAID INNER SERIES, SAID CARRIER BEING MOUNTED FOR ROTATION TO PRESENT THE VISION-CHECKING MEANS MOUNTED ON EACH OF SAID INNER AND OUTER SERIES OF FRAME SECTIONS TO BE SUCCESSIVELY VIEWS ALONG RESPECTIVE VIEWING PATHS AT DISPOSITIONS NORMAL TO SAID PATHS.