Can you get a pinhole camera with a fisheye lens? (for wider vision)
Depending where you've already got electronics mounted, and how big the camer is, it might be better to hide the pinhole in the brow or mouth parts.
The screen would be the tough part, though. Being less than 2 inches from your eyes, it really wouldn't be practical to use it to navigate unless you can set up a lens system to make the focal length longer (like what's done with wearable computer screens).