In Bangladesh, home to the world’s second-largest garment industry after China, some factory owners are working on supplying more glasses to workers to boost productivity. The country’s garment sector contributes about 11% of gross domestic product and employs around 4 million workers. VisionSpring, a global non-profit social enterprise supplying affordable glasses to people in poorer countries, estimates that roughly one in three Bangladeshi garment workers need glasses but do not have them.