The eyes do look like little black beads, don they?
They are like all mammalian eyes in that they have a retina, lens, iris, etc. Their pupil is round (like ours) when fully opened, and slits (like cats) when closed down in bright light; but unlike cats, the slits are horizontal, not vertical. As far as I know, all mustelid eyes are fully muscled and they can turn their eyes independently of their head much like we do, albeit with less range. (Besides, most people will turn their heads to look at something instead of cranking their eyes around. That is, unless you’re scoping out the fox/hunk next to you.) There are some significant differences, however, in the overall shape of the eye, the ability of the eye to focus, and of course, in the structure of the retina. Because ferrets are predators, the eyes mostly point forward (right down the nose), but because they are also prey for larger predators, the eyes bulge somewhat (for a wider view, like a wide-angle lens) and are somewhat centered to the side and top of the head when compared t
