JTL Want to try 10.11 for kicks? I suspect post 10.11 there are some GPU driver changes that affect even Nvidia GPUs. Trust me on this.
I might have a copy of the install image somewhere
I'm not sure there's any point. Numerous previous MacOS have run perfectly previously the only 'bad' version was the newest release. Now it's the last three, and I simply cannot explain that!
AgentX20 Numerous previous MacOS have run perfectly previously the only 'bad' version was the newest release. Now it's the last three, and I simply cannot explain that!
As for this, my closest working theory is either a system BIOS or VBIOS (GPU firmware) update may have been installed by an OS upgrade that borked something 
I wonder if there is a way to install 10.11 on a 2017 iMac (not officially supported), maybe run it from a USB drive? I already have 10.11 in a virtual machine, but without graphic acceleration it is unusable. So I cannot say how good it is for the eyes.
I can confirm, that the majority of problems began to arise somewhere around 2016-2017.
This includes (for me) all kinds of products with displays and even some software, like some games.
Yesterday i tried again World of Warcraft out of curiosity and after an hour already felt the discomfort. Today my eyes are still having this kinda focus-problem and probably tomorrow it will be gone again, as always before.
I'm not happy... Again...
JTL As for this, my closest working theory is either a system BIOS or VBIOS (GPU firmware) update may have been installed by an OS upgrade that borked something
This matches my own thoughts... I have gone looking for BIOS updates for this Macbook Pro (late 2013) version and there aren't any public updates for many many years, which sort of dampens this theory.
AgentX20 Yeah, which is why I went looking for OS updates that might have sneaked something in, and I couldn't see anything that corresponded to the onset of problems.
That's not an easy thing to do without actually taking apart the update files.
Even the update changelogs or Apples support site won't always list the firmware updates.
AgentX20 hey did you find a solution to this? literally just happened with me and my 2017 Macbook Air...
devilgrove hey did you find a solution to this? literally just happened with me and my 2017 Macbook Air...
I'm now running a fairly clean Mojave install and it's A-OK (for me). [touch wood]
poliakov I dont want to get ahead of myself, but I must say you might be onto something with the switchresx and the fact that it has to be exactly half of native resolution (and set to the non HDPI option in that resolution).
I will test this with the most difficult task for my eyes on new tech - writing and reading, and report here if that is successful. The enlarged and visible pixels definately help with eye fixation.
If its annoying and uncomfortable but doesnt trigger a bad headache like the normal resolution, then this is a definite breakthrough.
AgentX20 I tried that too, didn't work sadly, especially cause Mojave used to work for me perfectly. Glad you found a solution though.
devilgrove I tried that too, didn't work sadly, especially cause Mojave used to work for me perfectly. Glad you found a solution though.
It's just as well it works otherwise I'd have no 'work' computer to speak of...! [big phew]
Please, tell us model of display in your mbp 2015. You can find it in color profile and using terminal. Tell both
AgentX20 Please tell
mbp 2013 early or late 2013. Can use also check display manufacturer? It's really important for me
