Eagle's have very different vision compared to humans.
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The back of your eye, called the retina, has two kinds of cells: rods and cones. In bright light the cones are what we use, while in dim light the cones are less active and the rods take over.
This shows that our brains aren’t just open windows through which the world pours. They are always interpreting the information they receive. In this case, your brain knew your eyes were moving, and it interpreted the change in visual images as coming from inside your head.
Although this surgery might soon be available to the public, it’s worth wondering why we would want such enhanced vision. Most of us, like Clark Kent, don’t really need it. Unless, that is, you’re considering a career in the superhero business.