Eye+Color+Vision

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http://www.livescience.com/49238-fossil-eye-cells-color-vision.html

Chemistry of Vision https://www.ncbi.nlm.nih.gov/books/NBK22541/ In essence, //the light energy of a photon is converted into atomic motion //. The change in atomic positions, like the binding of a ligand to other 7TM receptors, sets in train a series of events that lead to the closing of ion channels and the generation of a nerve impulse.