dichromacy

Dichromacy is a form of color vision deficiency where an individual can only perceive two primary colors, rather than the typical three. This means they have a reduced ability to distinguish between certain colors, seeing many as identical that people with normal vision perceive as different.1

There are two main types of dichromacy:
* Protanopia: Individuals are unable to distinguish reds, oranges, yellows, and many greens. They primarily use blue and green to make color matches.1
* Deuteranopia: Similar to protanopia, individuals with deuteranopia also struggle to differentiate between reds, oranges, yellows, and many greens. They match colors using red and blue.1

Both protanopia and deuteranopia are classified as red-green color blindness. A rarer form is tritanopia, which affects blue-yellow color perception. Dichromacy is often an inherited condition, primarily affecting males due to its sex-linked nature.12