20/20 vision means that when you're 20 feet away from something, you can see it as well as a person with normal can see it when they're 20 feet away from it.
But what if that isn't perfect or optimal? What if the people they used to calculate normal vision had subpar vision?
Because 20/20 is considered optimal, our corrective lenses usually correct us to 20/20. But what if they could correct us to better with a different kind of lense? What if we could have superhuman distance vision? Among other things, imagine how that would improve driving safety!
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