Abstract
Observers with normal Rayleigh color matches who make errors on pigment tests have been classified as having Pigmentfarbenanomalie (PFA). We studied the visual characteristics of a case of PFA by measuring spectral sensitivities under various conditions. The spectral sensitivities on a white background showed three peaks although the peaks for the long-(L) and middle-wavelength (M) cone system were not as prominent as those of a normal observer. The patterns of sensitivity on a 430 nm background coincided with the sensitivity curve for L cones. The spectral sensitivity curve on a 700 nm background shows a broader shape in the middle and long wavelength region than that of either the L or M cones. The patterns of the field sensitivity action spectra for the middle and the long wavelength sensitive mechanisms coincided with the II4 and the II5 mechanisms of the normal observer respectively. The Fechner fraction of the M cone system showed significantly higher values than that of the L cone system. As a result, we are able to confirm the existence of both the L and M cones in PFA.
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