PhD, senior vision scientist in Essilor Center of Innovation & Technology Europe, Gildas Marin is a member of Essilor International’s Vision Sciences R&D team, based in Paris, France. Gildas is a graduate of the Institut of Optics Graduate School. He completed his training with a doctoral thesis in 1997 in Institut of Optics together with the Pitié-Salpêtrière Hospital (Paris) in medical imaging. His main research topics are vision modeling, simulation of optical effects and visual performances, in particular he studied the impact of optical aberrations on vision. More recently, he worked on improving refraction methodologies. Since 2015, he managed a research program on the development and validation of algorithms and methods of precise refraction implemented in the Vision-R800 and AVA offer.