Department of Ophthalmology, University of Catania, Via S. Sofia 78, 95123, Catania, Italy. matteofallico@hotmail.com. Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Via S. Sofia 87, 95123, Catania, Italy. andrea.maugeri@unict.it. Faculty of Medicine, University of Southampton, Southampton, UK. Department of Ophthalmology, University of Catania, Via S. Sofia 78, 95123, Catania, Italy. Department of Experimental Biomedicine and Clinical Neuroscience, Ophthalmology Section, University of Palermo, 90127, Palermo, Italy. Department of Ophthalmology, University of Bari, 70124, Bari, Italy. Department of Public Health, University of Naples Federico II, 80131, Naples, Italy. Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Via S. Sofia 87, 95123, Catania, Italy. Department of Surgical Sciences, Eye Clinic Section, University of Turin, 10122, Turin, Italy.