Dubbed iOptik, the system allows the users to see projected digital information, such as driving directions and video calls.

The tiny 'screens', which are the invention of Washington-based group Innovega, sit directly on a users' eyeballs and work with a pair of lightweight glasses.

Together, they provide an experience equivalent to watching a 240-inch television at a distance of 10 feet, according to Innovega's chief executive Steve Willey.

The system can work with smartphones and portable game devices to deliver video - or switch to a translucent 'augmented reality' view, where computer information is layered over the world we know it.

‘Whatever runs on your smartphone would run on your eyewear,’ Innovega chief Stephen Willey said in an interview with CNET.  ‘At full HD. Whether it's a window or immersive.’