Dual-focus contact lens prototypes ordered by Pentagon

http://www.bbc.co.uk/news/technology-17692256

The lenses are designed to be paired with compact heads up display (HUD) units - glasses that allow images to be projected onto their lenses.

Much bulkier HUDs are already deployed by the US Army and Air Force to superimpose data about targets and other status updates over users' views.

The tech could help troops enhance their awareness on the battlefield.

The lenses work by allowing the wearer to focus on two things at once - both the information projected onto the glasses' lenses and the more distant view that can be seen through them.