Flavio Rezende1, Natalia Vila2. 1. CUO-HMR, CIUSS de l'Est-de-l'Île-de-Montréal (University of Montreal), 5415 Assumption Blvd, Montreal, H1T 2M4, Canada. 2. St Paul's Eye Unit, Royal Liverpool University Hospital (University of Liverpool), Prescot Street, Liverpool, L78XP, UK. natalia.vila@rlbuht.nhs.us.