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Simple answer for the Sheepie is that vision is a chemical reaction. The light bleaches a chemical produced in the cells in the retina, and this reaction is then translated and sent via the optic nerve to the brain, where we interpret it as light. If a bright light is shone in, then all of the chemical is reacted away, and this will take some time to be remade. Thus for that time the area affected sends no signals, even if light is there, and appears dark. That is the dark afterimage, and the strange colours are as a result of the various colours having different chemicals that they react with, and they are depleted and rebuilt at different rates, thus giving the coloured fringes around the dark spot.You want more somebody else probably has it, or "Tag va Google".
The human eye is not equally sensitive to all colours,In bright light it is is most sensitive to green light ... ...sorry, you cannot view external links. To see them, please
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