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A few players shrugged off the suggestion, pointing out that if there was significant proof of the importance of vision training it’d likely be as mandatory as cardio or weight lifting is for the players. But they acknowledged there was probably no downside to the activities, especially the concentration it forces.

“When you have the glasses on, you’ve really got to do everything perfect,” Harper said. “You’ve got to focus. But once you take them off, you’re still focused and [the ball] looks bigger.”

NOTES: An MRI on Roger Bernadina’s strained right hamstring came back clean, and the outfielder is expected to miss no more than two or three games, Johnson said.

• Mark DeRosa will be away from the team until at least Friday following the death of his father, Jack.

• First baseman Chris Marrero and right-hander Ryan Mattheus joined Double-A Harrisburg on Tuesday to continue their respective rehab assignments, but the Senators were rained out.