Abstract
It was shown by the method of electrostimulation of the eye that spreading induction was refracted when a prism-shaped retinal image was formed on the way of its propagation through the retina. 1. The degree of refraction depended on the intensity and also the wave-length of light illuminating a prism-shaped patch whose image was formed on the retina. 2. The propagation velocity of spreading induction was measured to investigate its dependence on the intensity and the wave-length of adapting light. In the retina adapted to white light the velocity was higher than in the dark-adapted retina, while in the retina adapted to colored light the velocity was found lower than in the dark-adapted retina. 3. The refractive index computed from propagation velocities was in satisfactory agreement with that determined by measurements of refraction. 4. It was shown by many examples that the law of geometrical optics holds for spreading induction in the human retina.
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