From braille to Be My Eyes – there's a revolution happening in tech for the blind

Apps are linking visually impaired people to sighted volunteers as assistive technology enters a new era of connectivity

"Connected to other part," my iPhone says to me as I stand somewhere in London's Soho, trying to decipher the letter on the top of a bus stop.

"Hello?" says an American woman, reminding me of Scarlett Johansson's disembodied artificially intelligent character from the sci-fi film Her.