From the University of Rochester: Action Video Games Sharpen Vision 20 Percent.
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. [continue]