Position, size and luminosity of phosphenes generated by direct optic nerve stimulation.

Delbeke, Jean;Oozeer, Medhi;Veraart, Claude
(2003) Vision Research — Vol. 43, n° 9, p. 1091-1102 (2003)

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  • Delbeke, JeanUCLouvain
    Author
  • Oozeer, MedhiUCLouvain
    Author
  • Veraart, ClaudeUCLouvain
    Author
Abstract
Pulses of low intensity current, delivered through a cuff electrode chronically implanted around the optic nerve of a blind retinitis pigmentosa patient generate visual sensations. These phosphenes are obtained at lower thresholds for a train of stimuli than for single pulses, which suggests the existence of a spatial and temporal integrating mechanism. The perceptions are much smaller than those predicted from model simulations. A set of equations are derived which show the effect of pulse current, duration, number and frequency on the position, size and, to some extent, luminosity of the resulting phosphenes.
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Delbeke, J., Oozeer, M., & Veraart, C. (2003). Position, size and luminosity of phosphenes generated by direct optic nerve stimulation. Vision Research, 43(9), 1091-1102. https://doi.org/10.1016/S0042-6989(03)00013-0 (Original work published 2003)