I was so happy to get my new 4K iMac this week -- the Retina display is just beautiful. BUT: I can't use the thing for more than 10 minutes before feeling woozy -- my eyes feel strained and I get nauseous from a kind of motion sickness feeling. I am coming from a 2012 MacBook Air, which I can use for 12 hours straight without any problems. I also have an iPhone and iPad and don't have any issue with those screens. I've tried adjusting the brightness and scaling of the display, to no avail. Here are some theories: - Could it be the glossy display glass? I've never used a computer with this before. Is it different from iPhone/iPad's glossy display? - Could it have something to do with the scrolling / macOS motions on a larger screen? I feel like the effect happens more when I am scrolling webpages, switching between Spaces, etc. Maybe the screen is TOO smooth in its effects which is tricking my eyes somehow? And yet I scroll all day on my old MBA without issue. I would LOVE some insight here so I don't have to return my new iMac. But maybe I'll have to go Mac mini and use a non-glossy display or something.