Kenyans

This reputation sparked the interest of Singaporean photographer Nicholas Leong after he watched Kenyans dominate the Singaporean marathon in 2006.

Kenyans have come up with a variety of methods to try to eradicate the problem plant, including breeding a microorganism that feeds on the cactus and also turning it into food for humans.

Since January hundreds of Kenyans have undergone eye tests, not in a clinic with a doctor, but on their own doorstep, using a smart-phone application.