There are several variations of vision deficiency, such as:
Deuteranomalia (which makes everything look a little faded)
Protanopia (which makes everything seem a little green)
Tritanopia (greenish-pink tones)
and only around 0.00003% of the world’s population suffers from Monochromacy (total color blindness)
The most common type of color blindness is called Deuteranomalia. People with Deuteranomalia see a more subdued color palette, especially when it comes to colors like green and red, and many don't even know they have it.