Summary
The relative spectral sensitivity of the photopic component of the human electroretinogram was measured for wave lengths between 404 and 672 mμ in a state of moderate light adaptation. Light stimuli at a constant frequency of 32 per second were used to avoid scotopic contamination.
With stimulation of a small central area including the fovea and parafoveal zone, the photopic spectral sensitivity agrees roughly with psychophysical measurements for the red and green portions of the spectrum. However, at shorter wavelength there is a higher sensitivity determined by this method as compared to any available foveal luminosity curves. This blue discrepancy is not apparent when the “electroretinal” spectral sensitivity curves are compared to Wald's peripheral (8°) photopic luminosity curves.
Large-area stimuli which illuminate the retina further peripherally cause an increase in blue sensitivity which is maximal at about 460 mμ and is more pronounced at higher intensities. Nyctalopes show the same increase in blue sensitivity as normals when large-area stimuli are used.
The spectral sensitivity of the photopic component varies between protanopes, protanomalous, and normal subjects, with protanopes showing the greatest loss in sensitivity in the region of the longer wavelength as compared to normals, while the sensitivity of protanomalous subjects fell between the protanopes and normals. The maximum loss of sensitivity in the protanopes in the long wavelength end of the spectrum was at 585 mμ.
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Dodt, E., Copenhaver, R.M. & Gunkel, R.D. Photopischer Dominator und Farbkomponenten im menschlichen Elektroretinogramm. Pflügers Archiv 267, 497–507 (1958). https://doi.org/10.1007/BF00361736
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DOI: https://doi.org/10.1007/BF00361736