Area-Intensity Relation and Retinal Location in the Human Electroretinogram

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Abstract
Relation between stimulus area, intensity, and location in the human electroretinogram were investigated both for scotopic and photopic conditions. Potentials were picked up by a contact lens electrode and recorded with an electroencephalograph. Position of the reference electrode and effective pupil area, two previously neglected variables, were controlled. Area and intensity were of nearly equal effectiveness in arousing the electroretinogram, and the configuration of the stimulus was of little importance. Mapping the retina along the horizontal meridian with a single area showed that the retina was of a nearly uniform electrical sensitivity. Entoptic stray light may account in part for some of the findings.