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My fav eye surgery success story would be David Dellucci who had the surgery in November of 2004.
His career line up to that point was: .261/.339/.418 (.757)
Then at age 31 and 32, he posted these lines:
.251/.367/.513 (.879)
.292/.369/.530 (.899)
He then reverted back to career norm and retired shortly thereafter. Was is causal? Impossible to tell. Too many variables in play. But it's intriguing. How much is better vision and how much is increased confidence?