I was going to ask, how they know where to point the camera if they can't see. You answered that though. :) Not trying to be a jerk, it is just the first thing that popped in my head when I started reading your post. Very cool idea though!
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Oh yeah that was kind of an issue when I tried it, like I mentioned. It's just amazing to me that a lot of blind people have smartphones in the first place. I would think they'd have to wait a lot, just to navigate via text-to-speech.
Yeah good point. There are some pretty amazing assistive technologies out there. I deal with a lot of them in the education environment.