TRUJILLO, PERU – APRIL 20: A surgeon works on the eye of Reis-Buckler syndrome patient Diana, aged 17, during surgery onboard the Orbis Flying Eye Hospital on April 20, 2018 in Trujillo, Peru. Reis-Buckler corneal dystrophy is a rare genetic condition which causes the Bowman’s layer of the cornea to disintegrate. Diana’s mother Rosa has the same syndrome and has struggled with sight loss since the age of nine. After suffering with the condition since the age of three, Diana was chosen for a penetrating keratoplasty procedure (cornea transplant) during a programme run by Orbis, the ophthalmic training organisation. Founded in 1982 by ophthalmologist David Paton, Orbis trains eyecare teams across Africa, Asia and Latin America to improve the standard of eyecare in the region. As well as working in local hospitals, the charity also has a self-sufficient surgical unit on the Orbis Flying Eye Hospital, a converted McDonald-Douglas MD10 aircraft. (Photo by Leon Neal/Getty Images)