monochromacy
/ˌmɑnəˈkroʊməsi/
noun
- The condition of being completely colorblind, seeing only in shades of gray, black, and white.
- People with monochromacy cannot distinguish between red and green because their eyes lack certain cone cells.
- Because of his monochromacy, he relies on brightness and contrast rather than color to identify objects.
- The eye doctor explained that monochromacy is rare and affects about one in 30,000 people.