Welcome to 2010 (twenty-ten)

Growing up I had always understood that 20/20 vision was the benchmark for good eyesight, and to a certain extent that’s true. In terms of human performance, 20/20 vision is the nominal performance measure, however it’s not the best.

20/10 vision is better.

If you had 20/10 vision you would be able to see exactly the same thing as someone with 20/20 vision but from twice the distance. What they could see from ten metres, you could see with the same clarity and detail at twenty metres. What they see from one kilometre, you could see from two and so on and so forth.
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