What does the second 20 in 20/20 vision mean? My coworkers and i are stumped!
In: Biology
One twenty is the size of the font, the other is the distance in feet. Don’t remember which is which
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What does the second 20 in 20/20 vision mean? My coworkers and i are stumped!
In: Biology
One twenty is the size of the font, the other is the distance in feet. Don’t remember which is which
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