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rather famously had eye surgery performed before the 2011 season (although I would have sworn he had it before the 2010 season) and had a dramatic (though BABiP driven) resurgence.  He walked a little more, struck out a little less, but otherwise, all of his stats were almost identical to the previous year from ISO (.118/.116) to Whiff % (4.8%/4.9%) to xPX[hard contact measure] (72/74 - 100=Average).
Still, googling "Casey Kotchman LASIK" give you several news stories where Kotchman credits it for his turnaround and the very first (non-advertisement) hit is an advertisement for NVision Surgery centers.  Could it be that. 
It could be that improved vision (and in Casey Kotchman's case there was some sort of tear duct infection that corrupted his vision so this isn't a case where contacts would have worked I'm assuming) allowed Kotchman to more consistantly get the sweet spot of the bat on the ball and not necessarily hit the ball harder but maybe more firmly?  As in; instead of grounding the ball 5 feet in front of the plate, hitting it 30 feet so that it maintained most of it's velocity.  Or instead of parachute line drives that are only line drives because they only get 25 feet in the air, having them fly a little lower and get more  distance or hit the ground before the shortstop or second baseman can get under them.  Hopefully that's clear enough to understand, this is a case where a picture would be worth so many words.
The point is, that's what I would picture for Trayvon, seeing the ball a little clearer than a blur and hitting it with more consistency.  That's a long way of saying, I think the quality of his contact will improve and maybe how much contact (Kotchman was probably too high % of contact to improve), or maybe Kotchman was just lucky.