martin Will give it a try to Iris tomorrow, haven't used it yet.
I think you understood me the reverse way. I cannot handle smooth fonts and shapes and since ~2012 everything I have put my eyes on seems uses this by default!
Keywords for this are font rasterization, subpixel rendering, font anti aliasing, subpixel AA, LCD font smoothing (Apple), ClearType (Windows)
As soon I turned this off, I could instantly feel more comfort. I would say 90% my issue is solved, but there is still something left.
I have no problems at all with my new discovery Chromebook, I can sit now 12-14h a day without problems (this is super shitty quality and flickers like crazy but I don't have issues with flicker).
Disabled the smoothing on my Air and Retina too. The Air is much more comfortable now, the Retina is slightly improved but still not good enough :S
I also have enabled "Reduce Transparency". This feature on the iPhone X gave me similar improvement to the Retina after disabling smoothing.
I noticed that I should not enable "Increase Contrast" as that worsens my situation.
I matched the fonts on my Retina chrome with what's on the Chromebook
Standard font: Tinos
I plug them into x2 same monitors "Lenovo ThinkVision P27h-10 27" and match the resolution 1600x900 (60HZ) but I still can't get the comfort level from the Retina match that of the Chromebook. That external monitor where the Mac Retina is attached still produces much smoother picture (although now can visibly tell anti aliasing is off). I think it has something to do with the color depth/bit depth/buffer frame. Installed SwitchResX and Display Maestro 2 but both of them show only Millions. The Chromebook is maybe in thousands, not sure how to check :S Or maybe its 8 vs 16 vs 24 vs 32 bit