Some monitors emit horizontal wave and some emit vertical waves. Hope this kind of makes sense.
Using sun polarized sunglasses and putting them in front of the monitors makes the screen black. This is on my old monitors (Asus MX259) with no eye strain.
BUT if I turned the eyeglasses vertically, again the screen went black.
If you have polarized glasses and your monitor is ok with no eye strain... do the test and flip it over... see if you get eye strain or headaches.
My devices are:
Asus MX259 (Black in Horizontal)
Best monitor for my eyes
Asus Zephyrus G15 (Normal in Horizontal) and this laptop is bad for my Eyes
Benq EX2780q (Normal in Horizontal)
and this monitor is bad for my eyes
Let me know your experiences