A study of changes in cognitive evoked potentials in persons with visual impairment Anton Selskii, Maksim Zhuravlev, Anastasiia Runnova, Elena Grinina, Marina Konovalova and Rail Shamionov E3S Web Conf., 273 (2021) 10051 Published online: 22 June 2021 DOI: 10.1051/e3sconf/202127310051