Yeah, I just wanted to know if he can distinguish because in some countries you are not allowed to drive a car if you are colorblind.
As far as I know - and we had a course of colors in University some semesters ago - there are two different types of colorblindness: red-green and yellow-blue. ~5% of the population is red-green colorblind and 0.4% or something like that (you cannot really be precise about that) are yellow-blue colorblind. The "cones" in the retina are not so good or you don't so many if you are colorblind. There are 3 different kind of cones: red green and blue and all of them are more sensitive in another absorptionspectra-area. In your eye they are then bundled to red-green, blue-yellow and one other (I don't know exactly). So what I wanted to say is, that if you are red-green colorblind you may be able to see other colors correctly and also the degree of your colorblindness can vary. It is also known that colorblind persons have more rods so they can better see in the dark and in the corners of their eyes. Maybe he can distinguish very good between the brightness of the cube-colors.
I see absolutely nothing that would justify someone not being able to cube just because they are partially colourblind. Being colourblind doesn't give you arthritis...
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