achromatopsia

noun

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

: 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

achromatope

ˌā-ˈkrō-mə-ˌtōp 

noun

What was far more disabling was the painful hypersensitivity to light and poor visual acuity which also affect congenital achromatopes.

—Oliver Sacks, The Island of the Colorblind