[Page 20] Correspondence: Conflict of Interest: The authors report no conflicts of interest. Ilaria Biagini, CO Contributions: All authors contributed equally. Neuromuscoskeletal Department, Eye Clinic Accepted for Publication: May, 2018 University of Florence This work is licensed under a Creative Commons Attribution Florence, Italy Non-Commercial 3.0 License (CC BY-NC 3.0). E-mail: ilaria.biagini55@gmail.com ©Copyright Biagini et al., 2018. Phone: 39-339-60529 Licensee Ophthoscience Publishers, USA [Page 21] [Page 22]