For lawyer Julius Mbura, getting from a car park into his Nairobi firm's office can mean working around parked cars, narrow gaps, trees, furniture and ground that changes underfoot.

Mbura is a lawyer with a visual impairment.

He uses a cane to read the space closest to him, while a phone tool gives him more information about what lies further ahead.

The app is called Sightra.

As Mbura walks, it gives audio descriptions in real time, adding spoken guidance to the physical feedback from his cane.