it might be more than that, although laws start to come into effect. But I have several times not been able to see with my naked eye but used my scope or binos to see an animal still pretty easily. We had hit my moose last year at about 400yards, by the time we got to where we thought he was it was almost dark, we knew we hit him...he couldn't get over the windfall and was stuck on the hillside. We could only see his paddles with the naked eye at that time but the optics allowed us to finish him off.
Swaro and Vortex Binos, Nightforce scope