Oh mang. What kind of color blind?
More importantly, HOW DO YOU PLAY CATA?!
Tritanopia, which is usually called blue/yellow colorblindness. It's the type that most commonly affects women. Though to be honest, blue and yellow aren't so much the issue because I can generally tell them apart, it's blue and green that are the biggest hurdles.
And sometimes it makes Cataclysm harder than it should be. For example I have to look for a blank spot on the screen to spot out zombie cops, since they just blend into the black background, and swimmer zombies are really hard to tell from normal zombies unless they're surrounded by the right set of colors.