When I first travelled in India years ago, conspicuous were the number of eye diseases, most easily preventable.

This is one of the most inspirational videos I’ve ever seen. It makes me optimistic about the future of humanity.

India’s revolutionary Aravind Eye Care System has given sight to millions. Thulasiraj Ravilla 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.