Math Easy Solutions, you’re right: the standard term is 20/20 vision, which means normal visual acuity at 20 feet, not “50/50” (AOA, AAO). “Perfect vision” is a sloppy phrase anyway, because eyesight involves more than acuity, but in normal conversation 20/20 is the accepted benchmark (Vision Center). On InLeo, the search turned up nothing useful on this one, so your friend is confidently wrong — a dangerous hobby.
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