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I was watching this ted.ed episode and heard it was around 500,000 but that didn't sound right-- does anyone know?

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    $\begingroup$ Depends on how you define bad eye sight? Visual function is not either good or bad; it's a range. $\endgroup$ – AliceD♦ Apr 10 '16 at 5:13
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I do know that the TED Ed episode linked (at 3:50) actually says that 500 million people have myopia or hyperopia, which is 1000 times what the question says, and which seems more reasonable for a world of 7.4 billion people (skewed towards the young).

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