Just a side note to the OP, I have had the problem of getting sick while playing games my whole life. I never wanted to tell anyone about it because I was afraid the solution would be to just not play games. When I was 27 noticed I was starting to get sick just from looking at my phone and scrolling through FB/Twitter. I finally went to the Optometrist, it was the same song and dance as always: Look through the lenses, what looks better? Can you read the letters? You all know the drill. My vision was fine!

I told him how I was getting sick just looking at my phone, I told him I had had problems with video games ever since I could remember... then he suggested something else. We went back to the lenses and he would put letters out of focus, then focus them again and tell me to read them as fast as I could as soon as I could see them. He stared at my eyes the whole time with a magnifying scope.

Here is what was wrong: I have perfectly fine vision, however, my eyes take an extended time to focus. So when an image is moving (such as a scrolling phone screen or a video game) my eyes cannot focus fast enough to to keep up. Which causes my eyes to constantly try and focus on background/foreground/anything not moving. This is what causes the sickness.

He prescribed some glasses for me to wear anytime I am looking at a screen. (Phone, TV, video game, computer) It has been 2 years and I have not gotten sick (while wearing my glasses) a single time.

Just something you, or anyone in this thread might want to consider if you suffer from the same problem!