ADVANCE FOR WEEKEND EDITIONS, MAY 24-25 - In this Thursday, May 22, 2014 photo, Dr. Bill Harrison demonstrates a devise he uses with major league baseball players to improve their vision at the Baseball Performance Academy in San Juan Capistrano, Calif. A hitter will try just about anything to gain even a slight edge on a pitch that arrives in about the time it takes to blink. (AP Photo/Chris Carlson)
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