In the "Star Trek" fictional universe, a VISOR is a device used by the blind to artificially provide them with a sense of sight. A thin, curved device worn over the face like a pair of sunglasses, the VISOR scans the electromagnetic spectrum, creating visual input, and transmits it into the brain of the wearer via the optic nerves. The sensors are located on the side, that covers the eyes and attaches at small input jacks implanted in the temples. The only VISOR seen on screen was used by Geordi La Forge, who was blind from birth. VISOR is an acronym for "Visual Instrument and Sight Organ Replacement"; however, the complete term never appeared in the series, but only in novelizations and other written tie-in products.