
First, some words about the terminology herein…
Regarding the spelling of the word “color”… I apologize in advance to those whose local dialect insists upon it being written as “colour”. My birthplace-biased opinion is that it looks and sounds perfectly fine without the superfluous “u”. And… I am quite drawn to the greater symmetry in the word “color”.
Most people diagnosed as “colorblind” actually see a moderately colorful world. Technically, we are “color-deficient”. To varying degrees, we struggle to distinguish between certain colors. Most of us are not blind to all colors. However, when a passenger in my car tells me to turn right, just past the blue car, the fact that I can see blue under certain ideal conditions does not change the fact that I am completely blind as to where I have been instructed to turn. So, I’m mostly sticking with “colorblind”, because that is how it feels.