Measurement of visual acuity with a digital eye chart: optotypes, presentation modalities and repeatability Giada Campo Dall¿Orto; Alessio Facchin; Alessia Bellatorre; Silvio Maffioletti; Marina Serio;

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;

Measuring visual acuity and spherical refraction with smartphone screens emitting blue light Rosa María Salmerón-Campillo; Félix Tomás Varona-Gómez; Mari Ogino; Stephen Hunter; Vincent Hussey; Donny W. Suh; Rujuta Gore; Mateusz Jaskulski; Norberto López-Gil;