We!l, if 13 y.o. threads pop up, nice challenge to add something new.
I am mildly colorblind, a condition that is made worse by either green or brown tinted sunglasses. I mention this because of one very dangerous effect of that-- if I wear those color sunglasses, I can't tell whether the green or red light is lit up. It's a bit of a problem at intersections.
I don't have the problem with gray sunglasses.
I mention this because it's quite possible to not be aware of being mildly colorblind, and I only found out about the stoplight thing by dangerous experience.