4 ms·
Total color blindness (i.e. no functional cones, inability to distinguish any colors) is pretty rare, but some form of color vision deficiency is pretty common.
by evilduck 14y ago
Total color blindness (i.e. no functional cones, inability to distinguish any colors) is pretty rare, but some form of color vision deficiency is pretty common.
http://en.wikipedia.org/wiki/Color_blindness#Epidemiology http://en.wikipedia.org/wiki/Color_blindness#Epidemiology