Bad vision

I read once somewhere that a kid was not signed because he did not have 20/20 vision. Is that true ? can they use glasses? contacts?

It is (generally) seen as a bad thing to have less than perfect vision, even with correction.

20/20 isn’t really perfect vision. Having great eyesight can really help you as a hitter. Ted Williams credited his eyesight for helping to make his plate discipline so great. When he was tested for the military, he had a 20/10 vision. If I remember correctly, 20/10 vision is found in 1 in 10,000 Americans.