This to me is another amazing attribute they have to show how they are the ” boss of the woods.” To be able to see which way someone is looking with their eyes not their head at 100 yds or even 50 yds is just amazing. If thats the case they have to have the best vision of any hominid\Ape whatever you wanna call it in the animal kingdom. Maybe better than any species in the animal kingdom. Until Wes catches one to put in his garage lol ( sorry Wes it just cracks me up everytime you say that) nobody will truly know. But, one things for sure they eyesight is definetly superiour to ours.