Abstract
THOUGH the subject of theories of vision has been under discussion for many years, it has been suggested to me that a useful purpose would be served by a statement of the case for the visual purple theory in comparison with the duplicity theory. The visual purple view is that the cones are the sole percipient elements of the retina, being stimulated by the photochemical decomposition of the liquid surrounding them, the rods not being percipient elements but nerve elements regulating the supply of visual purple to the liquid surrounding the cones. Direct stimulation of the colourless transparent cones is against all photochemical laws, and these colourless transparent cones are surrounded by a highly absorbent photochemical substance, the visual purple, which when decomposed must produce an effect.
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References
” The Physiology of Vision” (G. Bell and Sons, 1920). ” Science and Pseudo-Science” (Bale, 1933).
NATURE, 136, 302, Aug. 24, 1935.
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Edridge-Green, F. Theories of Vision. Nature 136, 765–766 (1935). https://doi.org/10.1038/136765a0
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DOI: https://doi.org/10.1038/136765a0