The power of vision

What does it take to improve the lives of millions of people? The late Fred Hollows knew. He was known across the globe for his groundbreaking work in disrupting the global medical establishment, and his legacy lives on among the doctors he inspired. His most famous student - Dr Sanduk Ruit - has helped bring sight to over 125,000 people and trained thousands more doctors. In the process, he has directly improved the lives of millions of people. But what does it take to achieve transformation at this kind of scale?