1. Department of Ophthalmology, King’s College London, King’s College Hospital, London, England
2. Royal College of Ophthalmologists’ National Ophthalmology Database, London, England3Gloucestershire Hospitals National Health Service (NHS) Foundation Trust, Cheltenham, England
3. Guy’s and St Thomas’ NHS Foundation Trust, London, England
4. Royal College of Ophthalmologists’ National Ophthalmology Database, London, England5Bristol Eye Hospital, Bristol, England
5. Sunderland Eye Infirmary, Sunderland, England7Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, England