is present in one third of human retinal cone populations which has a maximum wavelength sensitivity of 531 nm. The absence of this pigment can lead to red-green colour blindness.

MEDIUM-WAVELENGTH PIGMENT: "Medium wavelength pigments are typically found in the retinas of human beings and allow humans to perceive the red-green spectrum."
Cite this page: N., Pam M.S., "MEDIUM-WAVELENGTH PIGMENT," in, April 7, 2013, (accessed October 18, 2021).