Researchers at the Massachusetts Institute of Technology (MIT) have invented a glass screen that corrects bad vision, without the need for spectacles or contact lenses.

When placed in front of a device's display it brings the image back into the viewer's focus.

The device is compatible with phones, tablets, TVs and even car dashboards.

BBC Click's Nick Kwek travelled to Boston to talk to the scientists behind the system.

More at BBC.com/Click and @BBCClick.