'For example, a blind person wearing Google's contact lens with a built-in camera may be walking on a sidewalk and approaching an intersection,' it says.

'The analysis component of the contact lens can process the raw image data of the camera to determine processed image data indicating that the blind person is approaching intersection with a crosswalk and establish that there is a car approaching the intersection.'

The lens also has wireless capabilities allowing it to link to a smartphone, which can be used to process data and give the user audio commands.

Google also says the system will be able to detect faces, potentially allowing the blind to recognise people.

The firm has already developed a smart lens capable of measuring the glucose level of diabetics.

'You’ve probably heard that diabetes is a huge and growing problem—affecting one in every 19 people on the planet,' Google said in a blog post announcing the research.