Experiments described in this paper demonstrate that a weak constant current when running through the eye ball may noticeably alter the sensitivity of rod vision as well as that of cone vision. The direction of these changes of sensitivity depends upon which pole is placed on the eye ball. In the case of cone vision this direction is also influenced by the wave-length of the light stimulus. The authors advance an hypothesis explaining the action of the constant current on the eye by changes in the relative concentration of Ca and K ions in the neighborhood of poles. Special experiments performed with Ca and K iontophoresis have confirmed this interpretation.
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