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We see by virtue of light waves reflected from variously textured surfaces, which waves impinge on the visual sensors. - (Tribesmen of Gor, Chapter 21, Sentence #443)

In its side there was a blackened hole, as though drilled; metal ran in droplets down the side of the ship. I suddenly realized, with elation, that the Kur could not see me. The ring concealed a light-diversion device, encircling the orbit of its wearer with a field. We see by virtue of light waves reflected from variously textured surfaces, which waves impinge on the visual sensors. We see by virtue of the patterns of these waves. The field about me, I conjectured, diverted and reconstituted these waves in their original patterns; thus, a given wave of light in the normal visual spectrum which might strike me and be reflected to the visual sensor of another organism did not now strike me but was diverted; similarly patterns of light from objects behind me were diverted about my field and reconstituted beyond it, to impinge, as though I were not there, on the visual sensor of an observing organism. The light by virtue of which I saw was shifted in its spectrum; it was, I suspect, originally in the nonvisible portion of the spectrum, perhaps in the infrared portion of the spectrum, which could penetrate the field, but was shifted in such a way by the diversion field that I, within the orbit of the field, experienced it in a range visible to myself. - (Tribesmen of Gor)