Mocé (pronounced mo-chay — a term of endearment meaning ‘grandfather’) lives in the town of Tienfala, in south-west Mali. Mocé lost his eyesight over thirty years ago by river blindness, an NTD caused by a parasitic worm transmitted by the bite of a black fly. He now walks with the aid of a cane and sometimes, when necessary, one of his grandchildren will help lead him when he needs extra assistance.