1. Department of Ophthalmology, Moorfields Eye Hospital, London, England
2. Optics and Optometry Department, Universitat Politècnica de Cataluña UPC, Terrassa, Spain
3. Centro de Oftalmología Barraquer, Barcelona, Terrassa, Spain
4. Department of Ophthalmology, Hospital de Terrassa, Consorci Sanitari de Terrassa, Terrassa, Spain