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achromatopsia

a·chro·ma·top·si·a [ ày krōmə tópsee ə ]


noun 
Definition:
 
1. extreme color vision impairment: a rare form of color vision impairment in which the world is seen only in black, white, and shades of gray

2. medicine 
Same as  monochromatism


[Mid-19th century. < Greek akhrōmatos "without color" < a- "without, not" + khrōmato- (see chromato-) + -opsia (see -opsy)]
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