Ol argedco luciftias said:
These traits are designed to let in more light. The eyes so you can see in dark and cloudy light like North Europe has, and the hair to let more light pass through into the skin for producing more vitamin D. Someone in a bright place like Africa, they would go blind if they had eyes this light sensitive they need to have darker eyes for the same reason they need darker skin. And North Europeans need very light eyes and hair for the same reason they need very light skin. I'm not sure if pure asians ever have blue or green eyes, but I'm not sure if they have lived anywhere it would be really necessary either. Think of how dark and cold it was in North Europe in the ice ages, they had such an absolute requirement of these traits that other people didn't need as much.
I hope you're not offended by me saying this, but I tend to disagree with you here.
Why? Because when its cold outside, you wear a hat, to protect your ears and you cover your face from your nose and ears freezing off.
Also, blonde hair under sunlight in summer lightens. In winter there is less light so it tends to be a bit darker natural.
As for the light responsitivity.
Snow blindness. Which is what happens when you look at snow too long when there is light, tends to happen higher up on the mountains though.
So what is super eyesight have to do with that? Also in winter time when the sun is out it stands really low, far north. Which can blind you while driving a car in example. I tend to wear sunglasses in winter time because of this.
But.. it does make sense too actually.