It can also make colors look less bright Blue-yellow color blindness is often referred to as acquired color blindness because it is most often acquired later in life due to an underlying condition or ...

Color blindness, or color vision deficiency ... In very rare cases, a person cannot see any colors. Monochromacy (achromatopsia) occurs when none of the cones that enable color vision work.

Most normal-sighted individuals would consider achromatopsia as a disability ... the knowledge of the mutation causing Pingelapese color blindness will need to be used thoughtfully and responsibly ...