I just took a test for color vision, based on the "Farnsworth Munsell 100 Hue Test".

I spent around 4 minutes on it (it's not timed, but I imagine spending more time with it might help get a better score) and got a perfect score of 0. But it doesn't give any good stats (just that "1 out of 255 women and 1 out of 12 men have some form of color vision deficiency", without defining what result would indicate a "color vision deficiency"), so I want to see how a bigger pool of people does with it!