QR to Speech is a Simple app that simply read out loud the content of a QR code.
This app can be useful for visually impaired person by combining it with a set of QR code stick on each element that needs to be identify.
For instance in the kitchen to make the difference between salt and sugar :) Works well for my grand mother !
An example with "Pepper" is available here : https://drive.google.com/open?id=0B8vpyq05iJuDNlFJT0xHNWQ2bTg