1 National Institute of Health Research Moorfields Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust, London, EC1V 2PD, UK.
2 Leeds Teaching Hospitals NHS Trust, Leeds, UK.
3 Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.
4 Hull and East Yorkshire NHS Trust, Hull, UK.
5 The Royal College of Ophthalmologists, London, UK.
6 National Institute of Health Research Moorfields Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust, London, EC1V 2PD, UK. sobha.sivaprasad@nhs.net.