I don't know if this is exactly for hand eye training but I've always seen these weird bubble grid things on walls in like, arcades and stuff? But apparently they're also used for real training. Anyway you stand in front of this like, 5x5 grid and one of the bubbles on the grid lights up then you have to whack it within a certain timeframe. I guess it's like vertical whack a mole. You get less and less time to whack the bubble as it goes on and you're trying to get as many as you can before you miss. It looks fun as hell to be honest, sadly I've never done it, they're always like $9 a play or something insane like that in an arcade. BUT I've always thought those would be amazing for like, goalies to train reaction times or hand eye stuff. If I could afford to buy one I think I would just for the fun of it but I imagine the training benefits are also numerous.