When I glance at the sun, or a bare light bulb, I find that when I blink, or move my eyes, a superimposed image of the bright object appears wherever I look. What is this called?
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Oxford English Dictionary:
"The impression retained by the retina of the eye, or by any other organ of sense, of a vivid sensation, after the external cause has been removed."
You used to get this with plasma televisions and it was called burn-in. Perhaps visual burn-in applies?