A modified Crozier-Holway discriminometer was used to take dark-adapted thresholds to monochromatic light at wavelengths 4000, 5100, 5900, and 6800я. 0.10 seconds thresholds to the same four wavelengths were taken after adaptation to 4.0 ft-L of each of the same wavelengths with narrower bandwidths. Data are presented as ratios of wavelength adapted to dark-adapted thresholds. No clearcut evidence that adaptation to a given wavelength depresses sensitivity to that wavelength more than to any other was found. The cost striking and practically significant result of the study was that adaptation to the longest wavelength (deep red light) appears to depress subsequent sensitivity across the spectrum.
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