India's revolutionary Aravind Eye Care System has given sight to millions. In 1978, Seva began working with Aravind Eye Hospitals in Madurai, India when Aravind was an 11-bed facility in a rented house. The aim was to get rid of one form of human suffering - blindness. Together, Seva and Aravind pioneered a model for high-volume, high-quality cataract eye surgery, in which two-thirds of eye patients receive free care subsidized by the fees of those who can afford to pay. In this TED Talk, Thulasiraj Ravilla of Aravind, looks at the ingenious approach that drives its treatment costs down and quality up, and why its methods should trigger a re-think of all human services.