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A member asked:
What causes images that you see after you stare at something for few seconds?
A doctor has provided 1 answer
Afterimages: If you stare at something steadily, you bleach some of the photopigments in the pattern of what you are staring at. You will see a negative or color reversal image for a short period until your photopigments regenerate.
Answered 1/30/2013
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