To my knowledge, most snake eyes are defense based. They are wide set so that they have a huge field of view, and as such cannot really focus on much of anything. It's basic purpose is to catch movement, i.e. a bird overhead or a predator on the ground. When your bp is facing it's prey (or you for that matter), it is not necessarily using it's eyes, but rather focusing with it's heat pits. So yes, they are basically blind to detail so I'm not surprised your snake was staring at a blank wall, or bumps into things at night. Atleast that's my guestimation based on they set-up of the eyes, the use of heat-pits, and their natural predators.