I take exception to the statement hogs have poor vision also. I had one old sow that would stay just at the very edge if what I could see through my scope in the dark. Almost like she could see what I was seeing. She actually left the path and took a detour through the woods, kind of an arch, just to stay far enough away I couldn't take a shot. She wasn't sniffling like she wanted to get my scent or turning her head from side to side like she wanted to pin point my position by hearing, she was looking right at me.

Maybe their eyesight is the lesser of their senses, their noses and ears are maybe better, but they seem to see just fine in dark.