V.N. declares that he has no competing interest.

M.L. has acted as occasional consultant during the last 5 years from Alcon, Allergan, Bausch & Lomb, DMG, Dompe, GSK, Horus Pharma, MSD, Novartis, Quantel, Santen, Shire, Sifi, Topivert and Théa.

S.L. received fees for consultancy for Orchedia, Quantel Medica, Santen, and Thea.

D.B.G. received fees for consultancy from Alcon, Bausch & Lomb, Hoya, Horus Pharma, Santen, Novartis, and Thea.

F.C. received fees for consultancy from Alcon, Bausch & Lomb,