While I've been doing photography for a long time, most of that time with my head firmly ... err .. elsewhere .. never thought of colours anything other than plain old colours.
But a few years AFTER I started in digital(maybe 2 .. 3?) and long before the technical parts of colour piqued my interest, I had a mate at work that once commented that he was colour blind(partially).
He had trouble with the distinction between red and green!
He only just made out the differences with traffic lights, but there was something that we were looking at on a PC, and he couldn't see it at all as it was red on green.

That anomaloscope site looked interesting .. except that I couldn't figure out what the end result it was telling me was.
Just showed me a purplish graph looking box, but not where my result was.