Simon Kamau, 26, has been in almost constant pain since he was a playful three-year-old and accidentally pierced his eye with a sharp object, but smartphone technology now offers hope.
His family live in an impoverished part of rural Naivasha in Kenya's Rift Valley region and could not afford the 80-kilometer (50-mile) journey to the nearest specialist hospital, leaving the young Kamau blind in one eye ever since.
Today, 23 years later, Kamau has a chance to better his quality of life thanks to a team of doctors from the London School of Hygiene and Tropical Medicine armed with an innovative, low cost, smartphone solution.
"Kenya was a natural test location," the project's team leader, Dr Andrew Bastawrous, told AFP. "For a country with a population of more than 40 million, there are only 86 qualified eye doctors, 43 of whom are operating in the capital Nairobi."
The equipment used in the study, which has been running for five years and is now in its final stages, is a smartphone with an add-on lens that scans the retina, plus an application to record the data.