Monochromacy (achromatopsia) occurs when none of the cones that enable color vision work. The person sees the world in black, white, and gray, similarly to an old black-and-white movie.

Achromatopsia, or rod monochromatic, is rare and causes color vision deficiency with all three cone types and issues with the retina. People with this vision difference mostly see black ...

Achromatopsia, also called monochromacy, is the rarest and most serious type of color blindness. People with this condition see the world only in shades of gray, black, and white. This type also ...

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