We aimed to extensively update estimates of global vision loss burden, presenting estimates for 2020, temporal change over three decades between 1990–2020, and forecasts for 2050. Summary Background To contribute to the WHO initiative, VISION 2020: The Right to Sight, an assessment of global vision impairment in 2020 and temporal change is needed. Interpretation Results suggest eye care services contributed to the observed reduction of age-standardised rates of avoidable blindness but not of MSVI, and that the target in an ageing global population was not reached. Leading causes of MSVI were undercorrected refractive error (86 8 million cases ), and diabetic retinopathy (0.3 million cases ), age-related macular degeneration (1.6 million cases ), undercorrected refractive error (2.2 million cases ), followed by glaucoma (3.The leading global causes of blindness in those aged 50 years and older in 2020 were cataract (15 However, the number of cases increased for both avoidable blindness (10
4%, while avoidable MSVI showed no change (0.Age-standardised prevalence of avoidable blindness decreased by-15 58 cases per 1000 people, 2010 prevalence 96.Findings Global crude prevalence of avoidable vision impairment and blindness in adults aged 50 years and older did not change between 20 (percentage change-0 Because of data sparsity at younger ages, our analysis focused on adults aged 50 years and older. We fitted hierarchical models to estimate prevalence (with 95% uncertainty intervals ) of moderate and severe vision impairment (MSVI presenting visual acuity from <6/18 to 3/60) and blindness (<3/60 or less than 10° visual field around central fixation) by cause, age, region, and year. Methods We did a systematic review and meta-analysis of population-based surveys of eye disease from January, 1980, to October, 2018. We aimed to compare the results with the World Health Assembly Global Action Plan (WHA GAP) target of a 25% global reduction from 2010 to 2019 in avoidable vision impairment, defined as cataract and undercorrected refractive error. We estimated the prevalence and relative contribution of avoidable causes of blindness and vision impairment globally from 1990 to 2020. With an ageing global population, the demands for eye health services are increasing. Background Many causes of vision impairment can be prevented or treated.
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