As an alternative to flux I use warmer light bulbs in my room. Anything with a temperature rating of 5500K and above. These are more blue rather than yellow, and look a lot more like natural sunlight. For me flux was hella bad and made things much worse. I absolutely hate yellow light, which is what normal light bulbs, flux and gaming glasses give you.
Also, look at something in the distance every 20 minutes or after every game. Spend 60 seconds doing something with your eyes. The majority of eye strain comes from the fact that eyes are meant to constantly be refocusing on different distances, which they aren't when we sit in front of the computer. Get up, walk around the room and look out the window. The extra blood flow will do wonders for your entire body and brain as well, not to mention help flush out emotions after those intense games.
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