I have the same issue. Before it was only PWM, but now any higher end laptop or phone seems to have this similar dithering tech and even screens without PWM, will cause severe eye train and bloodshot eyes within minutes or use. I'm able to use some of the lower end devices that have PWM on some brightness level, so that I don't use the screen below the level where the PWM kicks in. Unfortunately, this trend seems to be taking over all screens, so I fear that soon there will be no devices that I can use.
I just wonder if there would be ANY way to get this to the attention of manufacturers. The net is full of the threads in Reddit etc. where people complain this exact same issue, but are always met with ridicule and suggestion to go to the eye doctor.
Manufacturers also always respond with some idiotic suggestions on getting glasses or trying to reduce the brightness, when the source of the problem is flickering.
Sites like Notebookcheck do measure the PWM, but they insist that a PWM of more than 500 Hz should not cause any eye strain. I have had several phones where if the PWM is 2500 Hz or much more, I get the same eye strain as with OLED 240Hz. But if I set the brightness to a level where the PWM is not on, I don't get any eye strain at all, no matter how much I use the phone.
Most of the new laptops with high end screens do not have PWM anymore, but they do have the dithering, which causes the exact same problem.
This is scary how an issue like this which causes thousands of people with perfectly OK eyes to have such bad symptoms, gets overlooked over and over again.
And really ,there are also many people who do not seem to notice they have this issue - I hear many people complaining about dry eyes or eyes getting irritated after a long day at the laptop (MAC or windows). Not realizing that a laptop that does not have dithering or PWM, will not cause any eye strain at all. The screens I currently use, I can use 24/7 without any eye strain at all. I can play games and browse the net really 24h a day if I so want, without having any eye strain.
But a 30 minute session with a laptop with dithering or screen with PWM will cause my eyes to get bloodshot and my eyes will be dry and irritated also in the next morning. Moisturizing/lubricating eye drops will not help at all, because the source of the problem is the flicker caused by dithering and PWM.