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Which leaves the question as this: was Johnson playing both without contacts and without Lasik in 2008-09, leaving his vision at (say) 20/30?
In your experience, is it likely that a hitter is stepping up there with less than 20/20 vision and unaware of his available remedies?
Johnson did say, wow, I can see the laces now, so apparently he perceives an improvement relative to his own recent past -