The experiments done with the tongue input method that he referred to were actually quite impressive. A man that wasn't born blind but became blind after the fact described it as being able to see again but just shapes, no color, and a bit blurry. I am paraphrasing there but the idea was that with time the visual centers of his brain learned to take that input and create images with it to allow him to "see". The only immediate problem with this method was their test setup was very bulky and hard to use outside of a test environment. It has real potential in the future though.