Automatic self-recording visual field tester

Claim 1

IN AN OPHTHALMIC VISUAL FIELD TESTER, A SUBSTANTIALLY HEMISPHERIC PERIMETER BOWL, A FIXATION LIGHT AT THE APEX OF SAID BOWL, A NETWORK OF NORMALLY EXTINGUISHED LIGHTS VISIBLE UPON ILLUMINATION TO AN OBSERVATION POINT NEAR THE GEOMETRICAL CENTER OF SAID HEMISPHERIC BOWL, MEANS FOR LOCATING AN EYE OF THE PATIENT AT SAID OBSERVATION POINT, SAID NETWORK COMPRISING RADIAL GROUPS OF LIGHTS, EACH GROUP DISPOSED ALONG AN AXIS RADIATING FROM SAID FIXATION LIGHT ALONG ONE OF THE PREDETERMINED NUMBER OF GREAT CIRCULAR PATHS, SAID LIGHTS BEING EQUALLY SPACED ALONG SAID RADIAL AXES WHEREBY CORRESPONDING LIGHTS OF SAID RADIAL GROUPS DEFINE ADDITIONAL EQUALLY SPACED CONCENTRIC GROUPS, A SOURCE OF LIGHT OPERATING POTENTIAL, A FIRST PLURALITY OF ENERGIZING CIRCUITS EACH COMMON TO A RESPECTIVE RADIAL GROUP, AND A SECOND PLURALITY OF ENERGIZING CIRCUITS EACH COMMON TO A RESPECTIVE CONCENTRIC GROUP, STEPPER SWITCHING MEANS FOR SEQUENTIALLY CONNECTING EACH OF SAID FIRST ENERGIZING CIRCUITS TO SAID OPERATING POTENTIAL SORUCE, ADDITIONAL STEPPER SWITCHING MEANS FOR SEQUENTIALLY CONNECTING EACH OF SAID SECOND ENERGIZING CIRCUITS TO SAID OPERATING POTENTIAL SOURCE, SAID OPERATING POTENTIAL SOURCE, SAID FIRST MEMTIONED SWITCHING MEANS, SAID FIRST ENERGIZING CIRCUITS, SAID LIGHTS, SAID SECOND ENERGIZING CIRCUITS, AND SAID ADDITIONAL SWITCHING MEANS COMPRISING A SERIES CIRCUIT WHEREBY A LIGH COMMON TO THE SEQUENTIALLY CONNECTED ONE OF EACH OF SAID FIRST AND SAID DECOND ENERGIZING CIRCUITS IS ILLUMINATED, AND ELECTRIC PULSE GENERATING MEANS OPERATIVELY CONNECTED TO BOTH SAID STEPPER SWITCHING MEANS FOR ADVANCING SAID STEPPER SWITCHING MEANS THROUGH SAID SEQUENCE, MEANS TO VARY THE PULSE RECURRENCE FREQUECNY OF SAID PULSE GENERATING MEANS, AND PATIENT OPERATED RECORDING MEANS OPERATIVELY CONNECTED TO SAID FIRST PLURALITY OF SAID SECOND PLURALITY OF ENERGIZING CIRCUITS FOR RECORDING PATIENT RESPONSE CORRELATED TO IGNITION OF SAID PLURALITY OF LIGHTS.