Muhoroni, Kenya: When we arrived to interview her, we found Rispah Achieng Andega planting potato vines on her small plot. From the way she held the hoe and sank each potato stem into the mounds of earth, you would be forgiven for thinking that she had eyes.
The only pointer that she was different is when she quickly took a stick and drove it into the ground to mark where the work had stopped, after which she led us, groping, into her hut.