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Those tiny dots are actually blood cells moving in the retina of your eye.
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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.
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.