Dell Precision 7760 and Lenovo Legion 5

pjw_ Let me add that I consider my eyes normal.

Check out my previous post here. Binocular vision dysfunction / heterophoria are eye issues that most eye doctors won't test for and is completely unrelated to 20/20 vision.

pjw_ Regarding Legion, someone else had exactly the same problem (identical symptoms): https://www.reddit.com/r/LenovoLegion/comments/ozzl4t/lenovo_legion_5_causes_eyestrain/

Very interesting that someone on that Reddit thread has a hidden squint (a kind of eye issue) and gets relief by covering his/her right eye which @mike has been doing to train.

pjw_ Hmm, that is interesting.
Historically, Ledstrain was created as a community that tried to figure out what was happening with older tech and software. Spoiler: mostly dithering and PWM. So most of the threads and complaints here describe eyestrain, headache but there are way fewer complaints about light sensitivity.
On the other hand, on a huge Russian tech forum, there is a way newer thread where people complain mostly about modern smartphones, and light sensitivity is a complaint that often accompanies that struggle. I am one of those people. While both forums have all kinds of problems discussed, most of the participants have different underlying problems with tech. There is also another huge Russian-speaking forum about monitors (thread about eyes started in 2002 and has a few thousand pages), where light sensitivity sometimes arises. It seems that in the English-speaking internet, this complaint is instead scattered among review pages of different monitors.
Now back to smartphones. There are a number of complaints that they do create eyestrain together with red eyes and light sensitivity (on completely healthy eyes). It seems that monitors are less problematic in that regard. Smartphones need high brightness, good readability under direct sunlight, etc. You can use Note 10 lite, and that is definitely one of the 'bad' smartphones, it gave me a lot of trouble. So if by chance you faced something that is similar to those complaints, it should bother you only on a very-very limited amount of screens.
Complaints look like this: https://libredd.it/r/Monitors/comments/pmmt2l/trying_to_reduce_eye_strain_and_headaches_from/

At this moment of time, no one can tell if light sensitivity could be also triggered by FRC dithering/other dithering/anything else, I just see that there are few complaints about light sensitivity in that regard.

I collected a list of every known problem so far, you can go through it and check if anything helps. The smartphone problem is named Problem X there.
Part 1 https://ledstrain.org/d/1404-eyestrain-triggers/11
Part 2 https://ledstrain.org/d/1404-eyestrain-triggers/12

pjw_ Your description neatly matches Problem X... but on the other hand, I still have no clue if something else can cause these same symptoms

@degen pjw_
Well well well. Checked what can I find in Russian about Lenovo Legion 5.
Very first search result forums.lenovo.com. Google translated:

1. "Lenovo Legion 5 laptop, I can’t sit behind it, my eyes hurt very much, although there is an IPS matrix ... I bought a lenovo ideapad gaming 3 laptop in February of this year, and my eyes also hurt from it, only many times stronger, just unbearable (it’s much easier with this legion, albeit unpleasant). I sold it, thinking that it was some kind of individual reaction to the matrix. ... I have never had such a reaction to the screen before - I have an old monitor with a TN matrix, a phone with an IPS matrix and an iPad with an IPS matrix, and there was no such reaction to them."
2. "Same problem.
   Notebook legion 7 16ACHg6, 82N6000JRK
   After a short time behind the screen of the laptop, pain in the eyes begins, strong tension.
   In the evening, my head starts to hurt. People around noticed that an unhealthy gleam appears in the eyes.
   I work in the IT field, there are dozens of monitors in front of my eyes, there has never been such a reaction.
   The problem is exacerbated when you work with a large amount of text on a white background. It seems that it is difficult for the eyes to focus on the text".
3. The same crap. Eyes hurt (cut) after holding a laptop for more than half an hour. Notebook Lenovo ideapad 5 14are. All possible manipulations were carried out, nothing helps (there is no PWM. Full HD screen (1920x1080), IPS.

Search result number two, 4pda forum

1. "The other day I ordered a laptop Legion 5 15IMH05H - Type 81Y6 on the official Lenovo website. It has an IPS screen at 500 nits and 240 Hz (model B156HAN10.2).
   I have been using it for a couple of days now, and my eyes are very tired from the screen. Even at low brightness, it presses on the eyes and temples, very uncomfortable sensations.
   The display seems to pass the pencil test, and support claims that this model does not have PWM"
2. "What is your matrix?
   I have BOEhydis NV156FHM-NX1 120Hz
   Nevertheless, there is also a slight discomfort, I used macbooks before there were no problems"
3. interesting contradictory statement: "There was a similar problem only on Acer Nitro 5, my eyes hurt, there was pain in my eyes and my eyes could not focus on the text. I also tried different settings, reinstalled the drivers, but nothing helped. I suffered for a week, eventually changed it to Lenovo Legion 5 and the problem went away."

Search result number three, Ukrainian marketplace comments, Lenovo Legion 5 15IMH05. It seems this one has small sRGB match, 45%
"I highly do not recommend buying because of the screen, it's terrible. Firstly, this is not an IPS, but a WVA matrix, that is, TN with improved viewing angles, and secondly, the screen is dull, the colors are not natural, no calibration helps. On both laptops on the 2nd day black dead dead pixels appeared. Plus, it really hurts my eyes."

Dell Precision 7760 seems to be absent on the market, almost no search results.
The same with HP Omen 15-ek1018ca. Googled random HP Omen, goth this about HP OMEN 17-w226ur 3RM81EA
"After 2 weeks, my eyes began to get terribly tired and hurt when there was not even a hint of discomfort on a stationary computer ... I don’t know what to do anymore."
This is about HP OMEN 15-dc0019ur:
"Terrible screen, eyes hurt after an hour of work, poor color reproduction (which is why I use it in deuteranopia mode).
I bought a laptop in order to constantly carry it with me and so that I could play Overwatch, BF4, etc.
I use it with a monitor, because the display is terrible. I tried to set it up through the Intel application, but the red constantly resembles acid red - it is either orange or acid raspberry. You can use color blind modes in games, then you can finally distinguish colors."
I am not familiar with different laptop models, if there's some more specific model similar to 15-ek1018ca that is present on the Ukrainian or Russian market, I can check.
There are very few reviews about lenovo ideapad 3i.

Lenovo Legion 5 is an absolute winner (as there is no info on other contestants).
One more complaint:
"Hello everyone, I bought a Lenovo Legion 5 15ACH6H, the first month everything was ok, I worked / played quietly for many hours in a row, recently (I noticed this after installing cyberpunk, by the way) my eyes started to hurt from the screen, both in different games and at work , while I already tried a bunch of settings in the Nvidia control panel, it didn’t help"
And the final one:
"The screen is weird, sometimes it feels like it hurts the eyes"

Mrak0020 Not my Reddit post