I think it's more the sedentary nature of our screen dominated lives that cause most of the health issues. Beyond eye strain, or too much screen time in the evening causing sleep problems etc.
I just try to get up and move around at least once an hour (be it at work, or gaming/tv/tablet use etc. at home), exercise regularly--including outdoors stuff like runs, walks, bike rides etc. and eat decent to offset having a lot of desk time at work and gaming and tv/movies being big hobbies.