Have you got windows (particularly browsers with multiple tabs) open on desktop whilst you're playing games? Minimise all windows. Some games do that if you have stuff running on desktop that's not minimised.
Probably is ghosting,
It happens when I grab the top of a browser and swing it rapidly around the desktop in a circle, there's 4 clear instances of the browser that I can see(all at the same time :S), and on all 3 there are lines like this | | | | | making up the instance. Sometimes in-game they are instead mixed up with white lines, it sort of catches my eye and then in what must be a few mill secs it's gone. It happens with a clear desktop.
It's actually very much improved from the swift though, it's really hard to see if the instances are 5mm apart, which is probably why I haven't been looking at my pages in work and not been able to read them because of migraine aura's the swift has intensified the night before(light manifests my vision(after effects) and stops me from going to sleep, I take meds to dull my nerves just so I can sleep), don't get me wrong I absolutely LOVED the swift (I even got some heavy discount on it) but each session I would go on it ended with my eyes being really bloodshot and my veins really red with a very sharp burning sensation at the top of them when I went to bed and hot and cold sweats with visual snow the next day, I actually grew to be sort of scared by it. Maybe it was also the anti gloss coating making the light bounce into mist like pattens(mimicking aura's) , or the pixel structure. I'm still trying to get to the bottom of it. I have a glossy IPS which only effects me a tiny bit but I want something for FPS.

The reason I got the Benq is I was thinking hopefully they had fixed it because of their "eye care" research, I actually do not feel even half as bad as the swift with this monitor atm but it still hurts the next day after a session and I can feel my eyes getting more fatigued each night I use it and the effects get worse each day. I didn't have meds when I had the swift.
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