Why Cubs leadoff hitter Ian Happ sees vision training as baseball’s next frontier

The Cubs’ Ian Happ high-fives teammates after scoring during the first inning against the Los Angeles Dodgers at Wrigley Field on April 7. Michael Reaves/Getty Images

SAN DIEGO — Cubs leadoff hitter Ian Happ can picture a future where every MLB team will have a vision coach on staff, a sort of specialized hitting coach. In a league obsessed with sniffing out the slightest advantage, it’s almost hard to believe there hasn’t already been more of a push to find an edge in vision training.

“But it's just going to depend on if there's teams that want to invest money into it, I guess,” Happ said in a recent conversion with the Sun-Times. “Can you quantify it? Is it something you can say, this is…