achromatopsia

noun
achro·​ma·​top·​sia | \ˌā-ˌkrō-mə-ˈtäp-sē-ə \

Medical Definition of achromatopsia 

: a visual defect that is marked by total color blindness in which the colors of the spectrum are seen as tones of white, gray, and black, by poor visual acuity, and by extreme sensitivity to bright light

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