By means of a visual tristimulus colorimeter according to Guild-Bechstein, the following items were determined for a male deuteranopic observer on a foveal, i. e. 2° diameter visual field: (1) the deuteranopic missing color, by means of the perceptual criterion ``indistinguishably equal'', (2) the neutral zone, by means of the perceptual criterion ``neither blue nor yellow,'' (3) the alychne trace, by means of the perceptual criterion ``heterochromatically equally bright.''
Welche Nächte?springer springer