Dr. Sanduk Ruit is an ophthalmologist on a mission to restore sight to Nepal’s blind. He is the executive director of the nonprofit Tilganga Institute of Ophthalmology in Kathmandu, Nepal, and has operated on more than 130,000 patients.

He has adopted innovative surgical techniques for cataracts and often travels to perform operations, walking up to seven days hauling surgical equipment to reach patients who live in Nepal’s most remote villages. Why does Dr. Ruit do this? He lost family to treatable diseases and knows what it’s like not to have access to healthcare.