In the early 1990s, as Cuba faced a devastating economic crisis, leading to severe food shortages and malnutrition, around 50,000 Cubans were inexplicably struck down with sight loss.

One of America's leading eye specialists, Dr Alfredo Sadun, was invited to the communist-ruled island by Fidel Castrol to help figure out what was going on. Mike Lanchin spoke to Dr Sadun in 2021.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from football in Brazil, the history of the ‘Indian Titanic’ and the invention of air fryers, to Public Enemy’s Fight The Power, subway art and the political crisis in Georgia. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: visionary architect Antoni Gaudi and the design of the Sagrada Familia; Michael Jordan and his bespoke Nike trainers; Princess Diana at the Taj Mahal; and Görel Hanser, manager of legendary Swedish pop band Abba on the influence they’ve had on the music industry. You can learn all about fascinating and surprising stories, such as the time an Iraqi journalist hurled his shoes at the President of the United States in protest of America’s occupation of Iraq; the creation of the Hollywood commercial that changed advertising forever; and the ascent of the first Aboriginal MP.

(Photo: A man undergoes an eye examination in Cuba in1993. Credit: Adalberto Roque/AFP/Getty Images)