I was a goalkeeper for soccer, and I did a lot of hand-eye coordination exercises. The best one I've done is one where two small balls are thrown in opposite directions, you must catch the ball with the hand from the same side of where the ball was thrown. I know it may not be much, but I improved by peripheral vision tremendously, this also help my reaction time significantly. Another thing that helps hand-eye coordination ironically is video-games. Videogames often require a high-level of focus and hand-eye coordination, constantly testing your coordination even if it's something that is deemed as relaxing helps hone and enhance your coordination. The light game is a very famous one among athletes and the media where you have to tap the flashing lights or buttons in front of you before they go away. This is the most famous and most entertaining/fun one, many seem to enjoy it and it helps hone your skills.