While the team left for St. Louis following Sunday's game, Prado stayed behind in Phoenix on Monday and saw an eye doctor, who diagnosed Prado with having an allergic reaction.
"I was concerned it was only one eye," Prado said. "That's why I wanted to see a doctor to see if there's something else in there. But everything was fine and it was just an allergy in my left eye. With the medicine it goes away."
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.