1 Department of Ophthalmology, Guys and St. Thomas' National Health Service Foundation Trust, London, UK. Electronic address: sancy.low@nhs.net.
2 Department of Ophthalmology, Kings' College Hospital National Health Service Foundation Trust, London, UK.
3 FIECON, Hertfordshire, St Albans, UK.
4 Department of Ophthalmology, Guys and St. Thomas' National Health Service Foundation Trust, London, UK; Departamento de Glaucoma - Hospital del Salvador, Universidad de Chile, Providencia, Santiago, Chile.
5 Department of Ophthalmology, Guys and St. Thomas' National Health Service Foundation Trust, London, UK.