"You don't need eyes to see."

A few years ago I saw an interface for blind people which consisted out of a camera which was recording the contours of what was in front of it and translated that to an array of little actuators inside a device which the blind person would attach between his eyes. Unfortunately, I forgot about the projects name shortly after. Today I got to know BrainPort. It's very similar. Instead of using the area between ones eyes it uses the tongue, which is much more sensitive and differentiating than the skin. It applies a electrotactile stimulation over an array of actuators. The composition of the signal then creates (over the course of a learning process) an "image" of the situation. See the amazing device in action in this demo video.