Be My Eyes is an iphone app that connects blind people with volunteer helpers from around the world via live video chat.
If you install the app you are effectively putting yourself on call to help a blind person see. That could be a really simple task like reading the expiry date on a food product, or reading the instructions on some medice.
It uses video on the iphone so the blind person can point their iphone at the thing they need to be able to read.
Find out more here, http://bemyeyes.org/