What is the effect called when one looks at a bright light, and the image "burns" into one's eyes?
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?
An after-image.
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."
Flash blindness