I could when I was little but as I grew up and my eyesight worsened I slowly stopped being able to see it. At first it was just highlighters, than lights, than signs, than crayons, last was everything else. I can only see yellow if it is almost orange its so dark. Anything yellow looks white to me.
It's not the default, he probably flipped it himself or found it online. Just a joke-y profile pic, like when people have a Batman silhouette or something.
There is a form of colorblindness that is pretty rare, but it makes people see things as though they were watching a black and white tv: http://en.wikipedia.org/wiki/Monochromacy
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