In order to conduct this study, the Rochester team first had the Herculean task of finding college students who rarely played video games. After coaxing test subjects out of their caves and dens, the researchers had half the students play Unreal Tournament and the other half play Tetris over the course of a month.
After 30 days of fragging, the Unreal group improved their vision by 20 percent on eye exams. A more recent Rochester study using first-person shooters increased weekly play to 50 hours over nine weeks. This time the Unreal gamers saw a 43 percent increase in their ability to distinguish between shades of gray.
By the time he's 23, that kid will be able to see through walls.
And the Tetris players? They reported no increase in visual acuity. That's right; it's the murder that made them see better.