How Did Ancient Humans Survived without Glasses?

2.6 billion people alive today are nearsighted — and the genes behind it are tens of thousands of years old. So how did anyone survive the ancient world with blurry vision? The answer flips the whole question upside down. In this video, we trace the real story of human vision — from why myopia was almost nonexistent for most of history, to the polished rock crystal lens found at Nimrud, to the monks who invented "reading stones," to the printing press that accidentally created the first eyewear boom.