Trends in prevalence of blindness and distance and near vision impairment over 30 years: an analysis for the Global Burden of Disease Study - Bourne, Rupert; Steinmetz, Jaimie D.; Flaxman, Seth; Briant, Paul Svitil; Taylor, Hugh R.; Resnikoff, Serge; Casson, Robert James; Abdoli, Amir; Abu-Gharbieh, Eman; Furtado, João Marcello Fortes (The Lancet Global Health, 2021)