Why do you see stars if you bang your head?

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You may have heard some say," I bumped my head so hard, I saw stars!". What he thought to be stars was really a flash of bright light a trick played on him by the optic nerve, which goes from all parts of the eye to the brain. A hard bump on the head stimulates the optic nerve. It then sends a message to the brain, which translates the "bump" message as a burst of light, which most people describe as "seeing stars".