University of the Witwatersrand, University of the Witwatersrand, University of the Witwatersrand, University of the Witwatersrand, University of the Witwatersrand, St Thomas Eye Hospital, St Thomas Eye Hospital, Yaoundé Gynaeco Obstetrics and Paediatric Hospital, Yaoundé Gynaeco Obstetrics and Paediatric Hospital, Tshwane District Hospital, Tshwane District Hospital, Port Elizabeth Provincial Hospital, Port Elizabeth Provincial Hospital, University of Ilorin, University of Ilorin, Dr Agarwal's Eye Hospital, Dr Agarwal's Eye Hospital, Paririnyetwa Hospital, Paririnyetwa Hospital, Federal Medical Centre Asaba, Federal Medical Centre Asaba, Benjamin Mkapa Hospital, Benjamin Mkapa Hospital, Eye Foundations Hospital, Eye Foundations Hospital, University of Cape Town (UCT), University of Cape Town (UCT), University of Yaounde I - Yaounde Central Hospital, University of Yaounde I - Yaounde Central Hospital, Usmanu Danfodiyo University (UDUSOK) - Usmanu Danfodiyo University Teaching Hospital, Usmanu Danfodiyo University (UDUSOK) - Usmanu Danfodiyo University Teaching Hospital, Enugu State University of Science and Technology, Enugu State University of Science and Technology, The Eye Specialists Hospital, The Eye Specialists Hospital, Magrabi Eye Institute, Magrabi Eye Institute and University of the Witwatersrand