Noun
complete color blindness; colors can be differentiated only on the basis of brightness
Source: WordNetBlue cone monochromacy (X chromosome) is caused by lack of functionality of L and M cones (red and green). Source: Internet
Cone monochromacy can also be a result of having more than one type of dichromatic color blindness. Source: Internet
People who have, for instance, both protanopia and tritanopia are considered to have cone monochromacy. Source: Internet