A pair of glasses that is able to 'read' text and convert it into speech allowing blind and visually impaired people has been tested by scientists.

The device looks like a small camera attached to the side of a pair of glasses.

Using OCR - optical character reading - technology, the camera and tiny computer it contains can read printed materials.

It is activated by pointing it at an object and pressing a trigger button. The speech output is then fed into the earpiece of the person wearing the glasses.