Brainport is an experimental device that allows a blind person to "see" through their tongue.

Brainport is an experimental device that allows a blind person to “see” through their tongue. The system uses a minuscule video camera, which captures and translates images into electrical impulses that are experienced on the surface of the user's tongue.

The Independent explains the working of this device:

An image is captured by a camera mounted on a pair of spectacles and that pixilated image is translated onto an array of electrodes that's placed on the tongue so something that is darker could be made to tingle more and that sensation on the tongue corresponds to the image that is picked up by the individual and they have to learn what that image actually represents.

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