Research has been conducted on the global causes of blindness and vision impairment from 1990 to 2020. The studies suggest that there has been little progress in addressing global blindness over the past decade, with various analyses examining the prevalence of blindness and vision impairment due to conditions such as diabetic retinopathy. The findings have been published in several studies and editorials, with some focusing on specific demographics, such as women of childbearing age, and others examining trends over the 30-year period.