The equipment is also said to be able to store video files internally and can be recharged by plugging a power connector into the computing unit on the right-hand arm of the glasses' frame.

However, the most arresting detail is the suggestion that audio is provided without the user needing to wear headphones which might disturb how they hear ambient sounds.

Last week Google filed a patent application entitled Wearable Computing Device with Indirect Bone-Conduction Speaker.