Research has been conducted on the prevalence of blindness and vision impairment worldwide, with studies examining the issue by region and across various demographics. The global burden of blindness and vision loss has been analyzed in several studies, including those focusing on specific populations such as women of childbearing age and those with certain diseases. The studies, which cover different time periods, aim to understand the magnitude and trends of blindness and vision impairment, as well as project future prevalence.