Short-sightedness, known as myopia, was once a rare condition. But in East Asia, it is becoming ubiquitous, with rates increasing in the rest of the world, too. For decades, researchers thought the condition was mostly genetic. But the scientific consensus has changed. Host Alok Jha and Tim Cross, The Economist’s technology editor, wade through the latest evidence and explore how to prevent or slow the onset of myopia. And, how can the condition’s public-health burden be reduced?

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