Non-invasive electrical stimulation may diminish functional deficits of visual perception. This concerns not only the application of transcorneal electrical stimulation (TES) in patients with retinal and optic nerve disease as reported by Gekeler and Bartz-Schmidt [1] but also non-invasive transorbital alternating current stimulation (ACS). Basic stimulation parameters of TES and transorbital ACS are similar since in both approaches current intensity is individually adjusted according to how well patients perceived phosphenes. TES evidence was obtained in a recent randomized study with patients suffering from retinitis pigmentosa [21.
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