I spend several thousand dollars testing a few "eyesight for the blind" products by taking video on a head mounted camera, encoding the image as an 1 image per second audio file that is transmitted to the ears. I was actually able to get it to work as advertised, and I believe that given 10 hours a day practice for a month, you could detect a sense of depth perception and make out attributes in your environment through your audio cortex enough to walk around slowly without bumping into things. I had the blind friend test out the best I could do, and although it was a technological marvel, he actually didn't like it because it made people ostracise him even MORE than him being blind. He can move around slowly without bumping into things much more fashionably with the system he already had, a stick, good hearing, touch, and memory.<p>So a few insights:<p>1. If you are putting something in front of your eyes, or on your hat brim that looks like a hacked together bunch of cameras and wires and you wear it in public, there is millions of years of evolution causing people to ostracise you. It's so bad, that a blind person told me: "The ostracism from wearing it is worse than the ostracism from them realizing your blind."<p>2. You think you're confidant and can handle it? You aren't, inside you are millions of years of evolution to remove what is causing the ostracism. If you are the kind of person who can choose to remain single and lonely for life when you burn with passion for the opposite sex, then you have the kind of mettle it takes to wear cameras and wires on your head in public.<p>3. The experience I had with converting visual to audio and using my audio cortex was tremendous. For example objects that "popped out" at me during audio-vision were completely different than normal vision. Take a brick wall for instance: I could hear the distance between the bricks (cement) was smaller in one spot, and larger in another spot because of an anomalous blip in the audio file. When looking at it visually, you think "meh", it's just a brick wall. With the audio file, the different brick leaps out at you as an anomaly. Thus exposing the data structure/algorithmic differences between the visual cortex and audio cortex.<p>Doing visual as audio makes you an infant again, the tiniest changes in things leap out as fascinating. This experience I had could probably be sold to people bored to tears with life. A billion dollar idea! Be an infant again.