If the Yankees’ plan to use Giancarlo Stanton in left field this season is real, they need to get him acclimated on ways to play fly balls that find their way into the center of the sun piercing a cobalt blue sky. After struggling to corral two fly balls during a 9-1 loss to the Rays at George M. Steinbrenner Field on Sunday, Stanton said he needed something that doesn’t exist. “Sun-vision gloves, see right through the sun,” Stanton answered when asked how players can work on battling the sun. Stanton, who last played left field in the minor leagues eight years ago, lost Jake Bauers’ fly ball to left in the second as the ball glanced off his glove. In the fourth, Stanton battled the sun on Kevin Kiermaier’s fly ball that sliced away from him, got into the sun and went for a double. “I felt all right. I got some bad balls that didn’t help the team. I got to find a way to get behind them or something,’’ Stanton said. “I felt good. The routes were good, the rest not as. Yeah, they were in the sun, but it doesn’t matter. That’s part of the game.’’ Stanton admitted he felt more comfortable in left than during a first-inning at-bat against former Yankee Nate Eovaldi. “I felt worse in the box my first AB than I did my first time in left,’’ said Stanton, who grounded out to the right side. When camp opened, first-year manager Aaron Boone said he would look at Aaron Judge and Stanton, both right fielders, in left. That would enable Boone to give Brett Gardner a day off against lefty starters. And Fenway Park and Camden Yards seemed to be the ideal stadiums to do that because left field in those parks is smaller than most. Since left is the sun field in most ballparks, trying to teach a player a new position in the big leagues is risky.