Why do we see spots after our eyes are exposed to bright lights like camera flashes?
The cones are probably responsible for the strange colors involved, as they are concentrated in the central part of the eye. According to the American Optometric Association, your rods become more active in darker environments -- it can take up to 25 minutes for your eyes to become fully "acclimated" in a dark room.
If you're seeing spots without the benefit of a flash or a sudden change in ambient light, you may want to get to an eye doctor. You may also be interested to know that those strange shapes you occasionally see floating across your field of vision are known as "floaters," and are actually tiny clumps of cells floating inside the vitreous, or the clear jelly that fills your eye.
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