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Separation of the b photopic from b scotopic component of the electroretinogram.

Local responses were obtained from human retina, separating cone from rod components. Instead of using pencil of light, parallel beam of red light was allowed to enter the eye through fully dilated pupil. The optical system of the eye focused the beam upon the retina, creating local retinal stimulation to an area approximately 0.15mm in diameter. The beam of light was directed to the foveal or peripheral region of the retina, thus recording cone or rod component in the ERG. The dominating ERG component possessing amplitude high enough to be measured in single response curves was recorded by an ink-writing encephalograph.