colour-blindness for all but one colour
(mon″o-blep´se-ә) a condition in which vision is better when only one eye is used. blindness to all colors but one.
monoblepsia 1. A condition in which vision is better, or is more distinct, when only one eye is used; but there is confusion when both eyes are used. 2. A variety of color blindness in which only one color is perceived.