Pena exited Game 1 of the American League Division Series on Thursday after the second inning with blurred vision in his left eye. The Rays first baseman scratched his cornea at his home Wednesday night and said following Thursday's game that his vision had returned about 90 percent.
"If there's any concern that it will be inappropriate," Maddon said, "we will do something else."
In place of Pena, the Rays moved switch-hitting Willy Aybar -- originally the designated hitter -- to first base and put outfielder Rocco Baldelli in the DH spot. Rookie Fernando Perez took Baldelli's spot in right field.
Brittany Ghiroli is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.