Random fact: Although jumping spiders can't move their eyes, they can move their retinas to change their field of view. It's as if they're looking through a window.
If the spider is clear enough, you can even see the retinas moving through the cephalothorax:
Image sources: Melvyn Yeo, M.F. Land, and wmaddisn
note: only the largest pair of eyes can do this, the others have fixed fields of view