Apparatus for photographically plotting an ocular field

Claim 1

A SYSTEM FOR CHARTING THE VISUAL FIELD AND PRODUCING A PERMANNET RECORD, COMPRISING IN COMBINATION: A SCREEN HAVING INDICIA COMPRISING POLAR COORDINATES INCLUDING TWO NORMAL BLIND SPOTS, A CENTRAL FIXATION SPOT AND A PLURALITY OF CONCENTRIC CIRCLES ABOUT SAID CENTRAL FIXATION SPOT, AT LEAST AN OUTERMOST CIRCLE BEING OF A COLOR DIFFERENT FROM THAT OF AN INNER CIRCLE SO THAT THE INNER CIRCLE CAN BE MADE IMPERCEPTIBLE TO A PATIENT VIEWING THE POLAR COORDINATES TO FACILITATE PATIENT-FOCUSING ON THE POLAR COORDINATES, SAID INDICIA BEING SCALED FOR OBSERVATION BY THE PATIENT POSITIONED AT A PREDETERMINED DISTANCE; A PATIENT-POSITIONING MEANS SPACED FORM SAID SCREEN FOR ORIENTING THE PATIENT''S EYE AT THE DISTANCE FROM SAID SCREEN FOR WHICH SAID INDICIA IS SCALED; LIGHT-PROJECTOR MEANS FOR DIRECTING A SPOT OF LIGHT ONTO SAID SCREEN, SAID LIGHT PROJECTOR MEANS INCLUDING MEANS MOVABLY MOUNTING SAID PROJECTOR MEANS SO THAT A SPOT OF LIGHT MAY BE SWEPT OVER THE AREA OF THE SCREEN WHEREBY THE LIMIT OF THE PATIENT''S VISUAL PERCEPTION IS ACERTAINED; CAMERA MEANS HAVING A LENS FOCUSED ON SAID SCREEN; AND EXPOSURE-OPERATING MEANS FOR OPERATING THE CAMERA MEANS WHEN A LIMIT OF A PATIENT''S VISUAL PERCEPTION IS ASCERTAINED BY A SPOT OF LIGHT PROJECTED ONTO THE SCREEN FOR RECORDING ON A SINGLE FILM-FRAME, ONEBY-ONE, AS THE SPOTS ARE PROJECTED ONTO SAID SCREEN SO THAT THE RECORDED SPOTS PROVIDE A RECORD OF THE PATIENT''S VISUAL FIELD.

Claim 2

A SYSTEM FOR CHARTING THE VISUAL FIELD AND PRODUCING A PERMANNET RECORD, COMPRISING IN COMBINATION: A SCREEN HAVING INDICIA COMPRISING POLAR COORDINATES INCLUDING TWO NORMAL BLIND SPOTS, A CENTRAL FIXATION SPOT AND A PLURALITY OF CONCENTRIC CIRCLES ABOUT SAID CENTRAL FIXATION SPOT, AT LEAST AN OUTERMOST CIRCLE BEING OF A COLOR DIFFERENT FROM THAT OF AN INNER CIRCLE SO THAT THE INNER CIRCLE CAN BE MADE IMPERCEPTIBLE TO A PATIENT VIEWING THE POLAR COORDINATES TO FACILITATE PATIENT-FOCUSING ON THE POLAR COORDINATES, SAID INDICIA BEING SCALED FOR OBSERVATION BY THE PATIENT POSITIONED AT A PREDETERMINED DISTANCE; A PATIENT-POSITIONING MEANS SPACED FORM SAID SCREEN FOR ORIENTING THE PATIENT''S EYE AT THE DISTANCE FROM SAID SCREEN FOR WHICH SAID INDICIA IS SCALED; LIGHT-PROJECTOR MEANS FOR DIRECTING A SPOT OF LIGHT ONTO SAID SCREEN, SAID LIGHT PROJECTOR MEANS INCLUDING MEANS MOVABLY MOUNTING SAID PROJECTOR MEANS SO THAT A SPOT OF LIGHT MAY BE SWEPT OVER THE AREA OF THE SCREEN WHEREBY THE LIMIT OF THE PATIENT''S VISUAL PERCEPTION IS ACERTAINED; CAMERA MEANS HAVING A LENS FOCUSED ON SAID SCREEN; AND EXPOSURE-OPERATING MEANS FOR OPERATING THE CAMERA MEANS WHEN A LIMIT OF A PATIENT''S VISUAL PERCEPTION IS ASCERTAINED BY A SPOT OF LIGHT PROJECTED ONTO THE SCREEN FOR RECORDING ON A SINGLE FILM-FRAME, ONEBY-ONE, AS THE SPOTS ARE PROJECTED ONTO SAID SCREEN SO THAT THE RECORDED SPOTS PROVIDE A RECORD OF THE PATIENT''S VISUAL FIELD.