Hmmmm.
The ‘night vision’ thing intrigues me.
For my entire life, I’ve simply marched around in the dark yard or woods while my companions stumbled blindly.
I never gave it any thought.
Except for *total* darkness, I can see well enough to walk around without tripping.
Apparently populations can adapt genetically to some seriously changed conditions fairly rapidly ~ doesn't take 100,000 years to adapt you to 45 days of starlit skies ~ or to keep you from dying just because you were trapped in a glacial creek, underwater, for 6 hours!
The night vision thing isn't remarked on all that much by any of the folks who've done medical surveys of the Sa'ami, but they did find that some tribes have an 18% incidence of dental dysplasia of 3 or more teeth ~ that's a missing or twisted tooth BTW. In this case they're born with the tendency. Also, the Skolt Sa'ami, down to a mere 5,000 people in Europe, find the odor of mutton nauseating ~ still trying to figure that one out, but that's fur shur genetic!
They have a very high incidence of blondism with a low incidence of lactose tolerance ~ reindeer milk is so thick with cream it isn't drinkable anyway ~ so they make cheese out of it ($125 per pound currently), plus there's the possibility they can both ski and skate naturally without any training at all ~ the programming is built in!
Wouldn't be eating any wheat, barley or rye either, and best to visit the doctor when you have runaway atrial arrhythmia ~ something that has some usefulness in the far North but it can kill at these latitudes. Read up on Atrial Fibrillation now just in case you need to know about it.
Polarized glasses help!