The contact lens that sees double
13 April 2012 Last updated at 00:43 BST
The human eye can only focus on one distance at once, which makes it hard for people to read a heads-up display while looking at the real world.
Glasses with built-in screens allow users to see displays directly in front of them, but the field of vision is narrow.
But now a company has developed a contact lens that promises a much wider field of vision.
Click's LJ Rich explains.