In the question "How can I prevent Gaming Sickness?", the answer given by GalacticCowboy suggests reducing "visual strobing" as well as increasing framerate. I get how to increase the framerate in games, but I would like to know what settings I should look for in order to change the "strobing", since in none of the games I play can I find a setting that uses that word.
I believe he is just referring to the general effect of strobing in video games. Read more about it here:
I would take a look at the lighting settings in your games and possibly disabling them.
This is also a pretty good guide: