After the civil war, a team found that 4% of people around Mankien were blind, and almost 8% more had poor vision, mainly due to untreated diseases such as Trachoma.
Trachoma is caused by the bacterium Chlamydia trachomatis, which spreads through contact with an infected person.
At Nyeri Provincial Hospital near Mount Kenya, he trained paramedics and clinical officers to combat eye diseases such as glaucoma and trachoma.