Effect of gradient-index lenses on the optical performance of SyntEyes Veronica Lockett-Ruiz; Rafael Navarro; Jos Rozema;

Preliminary evaluation of smartphone-based addition measurement in a presbyopic population Rosa M. Salmerón-Campillo; Jose A. Diaz-Guirado; Gines Martinez-Ros; Mateusz Jaskulski; Norberto López-Gil;

Red and green defocus curves and duochrome test in different age groups Riccardo Rolandi; Fabrizio Zeri; Alessandro Duse; Giulia Carlotta Rizzo; Erika Ponzini; Silvia Tavazzi;