is a result of the eye only having one cone photo pigment and can therefore not discriminate colour- everything appears as a shade of grey.

MONOCHROMATISM: "Individuals who can only see in greyscale are normally diagnosed with monochromatis."
Cite this page: N., Pam M.S., "MONOCHROMATISM," in, April 7, 2013, (accessed January 15, 2021).