I remember being told growing up that playing video games was bad for my eyes. Just today (June 30th), a new article came out from Scientific American saying that this household wisdom may be incorrect. According to a new study from the University of Rochester, playing action video games may actually improve "core functions of vision". They reported that playing games like "Unreal Tournament 2004" and "Call of Duty 2" increased levels of "visual contrast sensitivity." This is the ability to distinguish between low contrast targets.
I think it is also good to remember, though, that there are negative effects to playing video games. Articles published though Science Daily show that 1 in 10 gamers ages 8-18 are addicted. In a separate article, they found that gamers who played over 7 hours a week and claimed a gaming addiction, got less sleep and were more tired then non-gamers. We are also in a society where obesity is a growing problem, and many kids don't get enough exercise.
Like all things in life, video games have their good and their bad. Personally, I really enjoy playing video games; however, I also spend time swimming and mountain biking. As I mentioned earlier, this is still fairly new research. We will have to see what happens as scientists get more time to study this media.
Sources- Scientific AmericanScience Daily- Nearly 1 In 10 Youth Gamers Addicted To Video Games