I'm here for this, I recently found out that I can't really distinguish shades very well, so pink just looks mostly red and I have a really hard time telling blue from green, but can usually make it out if I look hard enough and get at least 2 guesses.
Either that or my wife got my doctor in on a really intense year long prank.
I've always thought of smart as essentially the ability learn. Can you pick something up that you know nothing about, take a look at it and figure out how it works and how to fix/build it? That's smart in my book