Alan Smith,
An interesting part of the same show was about a technology that maps vision, at a low resolution, to "taste" by a grid-like device placed on the tongue. Special software connected to a small camera concentrated the "image" output on basic details. Both blind and blindfolded people were able to manage "seeing" with this fairly well (edges, contrasts, large bold letters, but nothing detailed), after some several days of experience. Brains were fairly adaptable to this. Some people said that food had a whole new dimension to it, but it was easy to switch back and forth from taste and "seeing".
A good friend of mine in the USA has spent years working on electronic retinal implants intended initially for Vets damaged while in military service. Good news is that it has just received approval for further widespread trials. Low-rez of course - but it will get better, in its current form it enables people blinded in adulthood to navigate the streets and unfamiliar indoor spaces with much more ease and increased safety. The future it sometimes seems, is here already.