A person who is completely color blind and sees the world only in shades of gray, black, and white.
From Greek 'a-' (without) + 'chroma' (color) + 'ops' (eye, sight). Created as a medical term to describe individuals with the most severe form of color vision deficiency.
An achromatope experiences the world like old black-and-white films—no reds, blues, or greens at all. It's incredibly rare (affecting maybe 1 in 30,000 people) and usually comes with other vision difficulties like light sensitivity.
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