After a vision test, doctors suggested that he try contact lenses during Spring Training. He did but the contacts tended to cause blurring in one eye so he switched to a pair of prescription Oakleys.
"I thought I was doing pretty well without these," said Pena, who hit better than expected last season, finishing at .267.
With his corrected vision this year, he's batting .160.
"I guess I'm not used to seeing the ball this good," he said, tongue in cheek.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.