from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A form of color blindness. Involves a defect in distinguishing between red and green.
from The Century Dictionary and Cyclopedia
- n. In physiology and psychophysics, a word introduced by von Kries to designate the form of red-green color-blindness termed by the Helmholtzian school ‘red-blindness.’
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue
The regular color blindness tests (Ishikawa plates) test primarily for red-green (protanopia and deuteranopia), and not for tritanopia.
I dunno .. if you look at the protanopia and deuteranopia pics on the wiki page for