Or in the case of this ophthalmologist from Nepal, it's 130,000 lights. Stationed in a country that houses as many as 90% of the world's blind population, and with surgery the only solution, Dr. Sanduk Ruit has developed cost-effective cataract surgery techniques and changed the lives of tens of thousands of patients from low-income backgrounds, by giving them the ability to see the world, literally in a new light.

Watch video below.