Oh I thought you were red-green. But good point about the mud.
Yes, but there's "red-green colourblindness" where your green receptors respond to redder wavelengths (the most common form), and there's "red-green colourblindness" where your red receptors respond to greener wavelengths (the one I have). Also two other forms of "red-green colourblindness" where you have no functioning red or green receptors at all, respectively.
And then there's the rare stuff, including where you have two of the above at the same time (giving monochromatic vision in the blue spectrum), anomalous/non-functioning blue receptors (the really un-subtle kind of dichromacy), complete absence of functional cone cells at all (ie. you only have night vision) and other assorted eye/neurological conditions that affect colour vision (which may not affect the entire visual field evenly).
In real life, it's bright-green/yellow and blue/purple I have most trouble discriminating. If I get red or green muddled up, it's usually knowing where red becomes brown (eg. spotting cricket balls on a muddy field) or green becomes grey. And in the case of the primary-red rugball shirts, I'm still seeing them as primary red, but somewhat darker than most people, which can help me to discriminate from a green of equivalent intensity, in a way a deutanerope wouldn't be able to.
