I am a 45 year old Male in the United States. I'm a software consultant/developer so I spend all day on computers for work and have for over 20 years. CRT monitors used to bother me but I could always fix it by increasing the refresh rate, which made them just fine to look at. I could always stare straight into any CCFL backlit LCD screen all day and not have any problems whatsoever. I started noticing problems as soon as the first LED backlights were used in computer monitors, I think my first exposure was a Lenovo Thinkpad sometime in 2006. At first, they were pretty easy to avoid but LED has become increasingly ubiquitous and is getting harder and harder to avoid.
In 2016-17 I bought 4 BenQ RL2460 monitors and have had mostly great success with them ever since. 2 of them I connected to a laptop provided by my current employer. It was an HP ZBook 17 running Windows 7 and, hooked up to my BenQ monitors, felt almost as comfortable as old CCFL LCDs.
The other 2 monitors I attached to a desktop machine that I built in 2017 with an Asus Rog Maximus Hero IX motherboard with Intel HD 630 Integrated Graphics. I always intended to add a graphics card but never got around to it. For most of the time I've had this machine it has been pretty good, though I always noticed it wasn't has comfortable as my Win7 machine next to it.
My problems escalated when my work replaced my laptop with a new HP 850 G6 with Windows 10 v1909 and Intel HD 620 Integrated Graphics. I noticed right away that even my trusty BenQ monitors weren't helping with whatever was wrong with the video signal from this new machine. I now get constant strain and headaches from that machine and have a hard time focusing while looking at it. What's worse, is that my desktop machine is now also bothering me more and I can't tell if I messed it up while experimenting to try to figure out the new laptop or if the laptop has just made me more sensitive in general. I do notice that all screens and even, to a certain degree, all light seems to bother me more than it did before getting this new laptop.
As for phones, I'm on my third Samsung Galaxy S3, which is mostly comfortable to look at, but every other phone I've tried since about 2012 gives me strain and headaches very quickly. I even recently tried the new 1plus with DC Dimming and it still bothered my eyes and gave me headaches. I might try an eink phone when my current GS3 dies.
I have a hard time with modern vehicles since they all have exectronic screens and almost all of the automotive screens are too bright and make use of PWM. We recently bought a 2020 Kia Sedona for the family as it is the least aggravating screen of all the family vehicles we tried. As for my own, I drive a 2012 Tundra with no screen in it and will probably drive it until I die, or somebody finally thinks to solve this issue.
I'm excited to find this forum and hope to give and get much help. I don't understand how Microsoft/Intel/AMD/NVidia can all be doing nothing (or so little) to help us out with this issue. I'm half considering applying to Microsoft's or Intel's graphics departments to get on the inside and start addressing the issue from there. My only trouble is, all my development experience is in higher level business applications and not in hardware drivers. Maybe I can get in anyway, who knows.