They differ from so-called 'locked-in' patients whose brain function is intact but are paralysed and communicate usually through eye or small head movements.

BBC: Finding a voice for the brain injured

Truth for Fermor lay in the details, and his books show the same straining eye for the small fact, the telling minutiae.

WSJ: At Home in the World

Above and to the right of the wearer's right eye is a small screen that can display Google search results, e-mails, reminders and other information.

CNN: Lawmaker: Google Glass and driving don't mix