I'm not an expert or know the real answer, but this is very interesting and I thought I'd comment. IMO I would like to think they -can- see straight ahead or directly in front of their faces. When in a striking position they always face you head on...so why would they do this and how would they know when u are in striking range if they could not see you? It's probably this way with all snakes. Not all of them rely on the heat pits since they don't have them, so I would think they cud see stright ahead. True they can smell and have a good sense of smell, but again how would they know when to strike. Maybe if a smell got stronger suddenlt...but I find it hard to think they can't see you at ALL.
Also my ball pythons sometime make a point to look at me directly from the front if I am near a cage. My spider has TURNED his head towards me to see a number of times, not just sat looking at me from the side. I'm sure he could see me before hand, but why turn himself more towards me if he wouldn't be able to then see me? Possibly to get a better veiw and look with BOTH eyes is the reason they move. I'm not sure...but I'd probably say they can.











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