During Game 7 of the 2014 World Series, SF Giants reliever Jeremy Affeldt couldn't see. Or maybe the problem was that he saw too much.
The San Francisco Chronicle has run an interesting series by Henry Schulman, with 10 key members of the 2010 World Series team speaking in depth about their experiences that year and in the years after. It's a great interview, filled with all sorts of fun stuff -- including his ... disagreements ... with manager Bruce Bochy in 2010.
But back to the topic at hand: Affeldt couldn't see.