GPS is a big one. Blind people have lots and lots of GPS apps as it is. However, right now we can hold our phones up to our ear to hear the instructions, use bone conduction headphones that sound pretty bad, or just put an earbud in one ear only. Whenever a blind person is traveling, a headset that blocks any outside sound just makes the blind traveler unsafe. What would be really useful is a quality headset, with built-in stereo mics, that plays the sounds of the outside environment through the headset, so it doesn't block blind people from hearing what's around us. Then it could just add the iphone audio into the mix of the environmental sounds. There is $1 that does this already, but of course the IPhone doesn't have stereo mics. So it means I still can't travel with headphones on, because I can't tell the direction of sounds.

Having been able to previously physically see the capabilities of augmented reality, the most immediate problem it would solve is waypoint navigation. Being able to point the phone camera at or down a street and have the augmented reality call out the stores you were next to, or the various sections with in a store when navigating inside of one would be very helpful. Perhaps calling out addresses you were next to, or syncing up with GPS transit data and being able to tell you if a bus or train is coming. Basically, AR would allow blind people to figure out exactly where they are if they happen to get turned around or lost, or are in an unfamiliar location.