Apple could be working on a wearable, head-mounted version of its his iPhone.

Patents uncovered this week show that the technology giant has been investigating a head-mounted display with transparent glass.

Google showed off early versions of its own ‘computer glasses’ – Project Glass – earlier this week. Companies such as Epson have already rushed to make their own versions.

Apple’s patents, filed in 2006, suggest that the company has been interested in the technology for a considerable time.