Working on hand eye coordination can be pretty difficult. In fact, there are many trainers and athletic professionals that believe that you simply cannot teach an individual to have solid hand eye coordination; that it is simply one of those skillsets that you are either born with or you aren't. However, I believe there is likely some science behind a certain number of training activites that will improve your reaction times and hand-eye work. In hockey, we need to be able to bat a flying puck out of mid-air in seconds to make plays. So if a teammate came to me looking to improve that set of skills I would suggest two things. The first, is lots of wally ball. Playing wally ball with a small racquet ball type object will almost assuredly improve a players ability to pick things out of the air. And its fun as hell. The second thing, would be just to spend more time after practice everyday standing net front and trying to tip pucks. We all know that this is the most likely use of hand-eye from an on-ice perspective. So it would make the most sense for a player to train how they want to play. So strap on those skates, get a stick in your hand and start batting pucks out of the air in your practice time.