To the Editor.
—It has been reported in a recent medical bulletin1 that a current alternating at 20 to 50 cycles per second, with an intensity of 2 to 7 volts at a maximum of 3 ma output from a photoelectric cell applied to the skin over the supraorbital nerve would enable a totally blind person to "see lights," "see plates on a dark table cloth," "to navigate on streets, etc." However, we have found that when this output was applied to the skin over the supraorbital nerve, no sensation of light was perceived by three totally blind (no light perception) veterans who had traumatically lost their globes (enucleated or phthisical) or had severed both optic nerves. When these same measurements of pulsed output from a photoelectric cell were applied to the skin over the supraorbital nerve (with indifferent electrode on the vertex or earlobe), it was found that
Weed CA, Correll RE. "SIGHT" IN THE TOTALLY BLIND. Arch Ophthalmol. 1967;78(3):416. doi:10.1001/archopht.1967.00980030418029
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