Effects of Chromatic Adaptation on Normal and Dichromatic Red–Green Brightness Matches*

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Abstract
The effects of chromatic adaptation on brightness matches between red and yellow-green spectral lights have been examined for normal and dichromatic observers. It was found that the matches made by the normal observers were altered by adaptation. At the lowest levels of adaptation the results were consistent with simple theoretical expectations, that is, red adaptation resulted in more red being required to reestablish the match and green adaptation resulted in less red being required. At higher levels adaptation at all wavelengths studied resulted in more red being required. In the case of the dichromats (protanopes and deuteranopes) no evidence was found of changes in matches as a function of adaptation. The results are interpreted as indicating that deuteranopes, as well as protanopes, have but one functional photopigment operating in the long-wavelength portion of the spectrum.

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