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Oct 11, 2021 at 11:45 comment added FumbleFingers This is clearly the best answer to your question. Just a shame you can't upvote or accept it (because you posted it yourself). I would just note that most Anglophones are familiar with the expression 20/20 vision - but in my experience people usually understand it to mean [near-]perfect eyesight, rather than simply "average", and it's very uncommon to hear that format used with any other numbers.
Oct 11, 2021 at 3:41 history edited Qiulang 邱朗 CC BY-SA 4.0
added 60 characters in body
S Oct 11, 2021 at 3:32 review First answers
Oct 11, 2021 at 4:45
S Oct 11, 2021 at 3:32 history answered Qiulang 邱朗 CC BY-SA 4.0