An AP article looked at the benefits of vision training for the University of Cincinnati baseball team. The article also mentions that Steve Lombardozzi of the Nats does vision training, with strobe goggles, almost every day. He says that the training allows him to see everything much better, from the pitcher's windup to the spin of the ball. Lombardozzi said that the team's eye doctor recommended the strobe goggles. It's hard to argue with the results so far.
If teams think such training is valuable, then why don't they emphasize it more? Why not ensure that every hitter does some of the training on a regular basis?