A new study by the University of Rochester has provided empirical proof that playing video games is actually good for your eyes. If you play a few hours a day over the course of a month, you can improve your vision by about 20 percent.
They used shoot-em-up action games in the experiments, so here I go w/ my cross-promotion. Star Fox Command (Nintendo DS) is the fifth game in the series that follows pilot Fox McCloud and his team defending Corneria in air combat. Supports the Nintendo Wi-Fi connection; can be played online.