Yeah, I am a mutant, got also something called crepuscular vision, I can almost see in the dark, not when it is pitch black, but only when is a bit of light around, close to the cats, but not quite. Some strange genes from the maternal side, going only to males, grandpa got that also.
Actually 2x is quite often seen, like 1 in 20k if I remember right, the best is x10, called also eagle vision, only one in a few million, some Finnish sniper had that, for what I know. Just imagine!