1. Birmingham and Midland Eye Centre, Birmingham B18 7QH, UK
2. Modality Ophthalmology, Modality Partnership, Birmingham B19 1BP, UK
3. Department of Ophthalmology, Royal Free Hospital, London NW3 2QG, UK
4. University Hospitals Birmingham NHS Foundation Trust, Birmingham B15 2GW, UK
5. Academic Unit of Ophthalmology, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK
6. New Cross Hospital, Royal Wolverhampton NHS Trust, Wolverhampton WV10 0QP, UK
7. Academic Ophthalmology, School of Medicine, University of Nottingham, Nottingham NG7 2RD, UK