noun. A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.

noun. 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.’

noun. A form of color blindness. Involves a defect in distinguishing between red and green.

noun. 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."

deuteranopia  tritanopia  

red-green color blindness  red-green colour blindness  red-green dichromacy