1. Department of Ophthalmology, “S. M. Goretti” Hospital, Sapienza University of Rome, Via G. Reni, 04100 Latina, Italy
2. Department of Ophthalmology, “A. Fiorini” Hospital, Sapienza University of Rome, Polo Pontino, Via Firenze, 04019 Terracina, Italy
3. Department of Sense Organs, Centre of Ocular Electrophysiology, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy