March 1977
Volume 16, Issue 3
Articles  |   March 1977
The electrical stimulation of the retina by indwelling electrodes.
Investigative Ophthalmology & Visual Science March 1977, Vol.16, 249-252. doi:
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      W W Dawson, N D Radtke; The electrical stimulation of the retina by indwelling electrodes.. Invest. Ophthalmol. Vis. Sci. 1977;16(3):249-252.

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      © ARVO (1962-2015); The Authors (2016-present)

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Chronically implanted intraocular electrodes were used to stimulate visual cortical responses to current passage through the retina. Electrical current threshold for the light-adapted cat retina lies in the region of 30 to 100 X 10(-6) amps. for the conditions used. Dark adaptation caused a large threshold increase. Retinal excitability also decreased when electrical stimuli were delivered more often than one per 5 seconds. Effective charge-density threshold was moderately greater than reported for frogs and humans.


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