n defective color vision characterized by decreased ability to detect differences in color. See also achromatopsia.
blindness, color, blue-yellow,
n a color disability in which the spectrum is seen in reds and greens; a form of protanopia.
blindness, color, red-green,
n the more common form of color disability, in which the entire spectrum is constituted by yellows and blues; a form of protanopia.