Definitions

1. noun

A form of red-green colour blindness in which a person has difficulty perceiving red light, but has normal vision for green and other colours.

“The doctor diagnosed the patient with protanopia, affecting their ability to see traffic lights.”

2. noun

A type of cone monochromacy, a rare condition in which a person sees the world in shades of yellow and green, but lacks red vision.

“The researcher studied the rare case of protanopia in a patient with cone monochromacy.”