The rule is every 20 minutes look 20 feet away for 20 seconds. They say to keep ... | Hacker News

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soared on Sept 30, 2019 | parent | context | favorite | on: Increased rates of myopia linked to reduced time o...

The rule is every 20 minutes look 20 feet away for 20 seconds. They say to keep 20/20, follow 20/20/20.

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