I don’t play the action games like I used to. The original Quake (I so pwned with the off-hand grappling hook mod) and Unreal Tournament (still the best of the bunch, although UT2004 is awesome) were my favorites. By my slowing reaction time (as a 36 year old gamer, I’m ancient by twitch-game standards) and frequent hand tremors leave me unable to compete against most of the folks that play shooters. However, if I could/did still play them, I would apparently benefit from improved visual acuity after playing (bonus shortened URL available as well).
Video games that contain high levels of action, such as Unreal Tournament, can actually improve your vision.
Researchers at the University of Rochester have shown that people who played action video games for a few hours a day over the course of a month improved by about 20 percent in their ability to identify letters presented in clutter–a visual acuity test similar to ones used in regular ophthalmology clinics.
In essence, playing video game improves your bottom line on a standard eye chart.