If you would like to learn more then take a look at this article in Nature: Training the brain to overcome the effect of aging on the human eye
Taking the experiment as inspiration, the game of Eagle Eye was created. The aim is to click on the digit zero, which appears in a random position in the play area. When you do, the digit zero will pop up somewhere else and essentially it is a game of Whack-a-Mole, but there's a twist.
The twist is that the higher the level that you select, the harder it becomes because the font colour becomes increasingly lighter. Level 1 is very much like a game of Whack-a-Mole, while Level 15 is like trying to spot a polar bear in a blizzard.
No claims are made about this game with regard to improving your eyesight. However, it is quite good fun to play and you might start thinking about cleaning your monitor (it's not designed for mobile devices).