There’s also the impact of providing glasses for children on education outcomes. From the 2023 GEAP report:
“Mass testing and distribution of eyeglasses to students with refraction errors improved test scores in two separate studies in four different locations in China (China-1, 2), although positive impacts were not found in all counties. The benefits were greater for underperforming students (China-1). Poor quality of schools might explain why glasses did not improve learning everywhere (China-2). At least one study was large-scale (2,500 schools). In these studies, eyeglasses have been shown to be highly cost-effective at increasing learning.”
There’s also the impact of providing glasses for children on education outcomes. From the 2023 GEAP report:
“Mass testing and distribution of eyeglasses to students with refraction errors improved test scores in two separate studies in four different locations in China (China-1, 2), although positive impacts were not found in all counties. The benefits were greater for underperforming students (China-1). Poor quality of schools might explain why glasses did not improve learning everywhere (China-2). At least one study was large-scale (2,500 schools). In these studies, eyeglasses have been shown to be highly cost-effective at increasing learning.”