complete color blindness

Complete color blindness, or achromatopsia, is very rare but more severe.

Complete color blindness (very rare) is simulated at right.

People lacking the three types of photopigments are said to have complete color blindness or achromatopsia.

Achromatopsia, or complete color blindness, is presented as an ideal model to develop gene therapy directed to cone photoreceptors.

They include problems in discriminating blues from yellows, and the rarest forms of all, complete color blindness or monochromacy, where one cannot distinguish any color from grey, as in a black-and-white movie or photograph.

In addition, he was born with a congenital disorder called achromatopsia; complete color blindness; a defect of the cone cells in the eyes which causes him to see in black and white, and resulted in qualifying him as being legally blind.