S Vaz-Pereira1,2,3, L Collaço1, G De Salvo4, P van Zeller1. 1. Department of Ophthalmology, Clínica São João de Deus, Lisbon, Portugal. 2. Department of Ophthalmology, Hospital de Santa Maria, Lisbon, Portugal. 3. Department of Ophthalmology, Faculty of Medicine, Universidade de Lisboa, Avenida Professor Egas Moniz, Lisbon, Portugal. 4. Eye Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK.