How many games use “Detective Vision” these days? The Arkham series is the first usage I know of, but now we also have Witcher, Tomb Raider, and Dishonored. It’s been years since I played Assassins Creed, but I seem to remember some sort of alternate vision in that game. I think one of the Far Cry games used it?
So then the developer comes to the problem: We want the player to be able to use “detective mode” (or whatever it’s called in this game) but we don’t want them to leave it on all the time.
I like the Tomb Raider solution best: It takes a second for the vision to fade in, and it gets canceled when you move. This makes it something you do to survey the space before you act, not something you toggle at will.