Right now, Google Glass, which places a small computer screen above one eye and has a built in motion sensor, camera and microphones, acts like an extension of a person's smartphone.
It lets the user take photos and record videos by touching the side of the device or speaking commands aloud, as well as allowing them to give Web users access to the device's camera so they can "see" what the wearer is looking at. People also can use Glass to make phone calls, access Google's Web search, get turn-by-turn navigation information and receive text messages on the screen, as well as send texts using their voice.
http://online.wsj.com/article/SB10001424127887324767004578489503146013208.html
It lets the user take photos and record videos by touching the side of the device or speaking commands aloud, as well as allowing them to give Web users access to the device's camera so they can "see" what the wearer is looking at. People also can use Glass to make phone calls, access Google's Web search, get turn-by-turn navigation information and receive text messages on the screen, as well as send texts using their voice.
http://online.wsj.com/article/SB10001424127887324767004578489503146013208.html