Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 48
are excited to a high degree, while the elementssensitive to the other are excited to a considerabledegree. RED-BLINDNESS. According to the Young-Helmholtz tlieory blindnessto red is due to the absence or paralysis of the organsperceiving red (Fig. 12). Red-blindness has, then, buttwo fundamental… … rated green of a feeble intensity, more saturated thannormal green, into which a sensible portion of the otherprimitive colors enters. Feebly-luminous red, whichaffects the perceptive organs of red in a normal eye suf-ficiently, does not, on the other hand, sufficiently excitethe perceptive organs…
Color-blindness · Eye
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