DishaSamir It depends on your budget and what preferences you have
Eyestrain is very individual sadly, so, what may work for some may not work for other!
From PWM (flicker, motion artifacts from PWM), LCD inversion artifacts, motion blur, AG coating, polarizer, brightness, color gamut, dithering to improper posture, stress, not using eyeglasses and using monitor too close to the eyes, a lot of factors are in play!
You should mention what displays you've had success with and which ones didn't work for you, to narrow down the choice!
To minimise the most common culprits of eyestrain, you should consider getting a reviewed monitor so that you can evaluate whether it satisfies your conditions.
updated july 2024
1080p (24") +200hz section
XL2566K
Dell S2522HG (uses static dithering, i'd avoid it if possible)
• Viewsonic XG2431 / AOC 24G2ZU (24G2ZE) / XG249CM / VG249QM1A (all the same BOE panel, i'd avoid XG though since it seems to have some kind of flicker during transitions)
• Asus VG259QM / MSI MAG251RX (same panel)
• Dell AW2521HF(A)
• Omen X 25
• VG258QM
[all of these above use older LCD backlight - WLED]
[E-TN panels use newer backlight]
1440p (24-27", 240hz), (avoid sub 200hz, too blurry)
[This is where the issue starts, as this is where KSF/QDEF backlight's are very common]
- Omen X 27 (beware, this one has PWM at >1000Hz, as measured by RTings, sadly very vague but it's a thing)
- AOC AGON AG273QZ (0% brightness is 130 nits, be aware of its flaws - look at tftcentral video)
- Odyssey G7 (now as of 2024, called Odyssey G6, scanline issues)
- WOLED (PG27AQDM, XG27AQDMG [glossy], LG 27GR95QE, AG276QZD, 27QHD240, X27U)
[rest on the market is either unreviewed or KSF/NanoIPS or QDEF - potential eyestrain concern]
The higher the refresh rate, the better (especially if the the response times are in the refresh window) the motion performance, which is something everyone should strive for (especially if eyestrain is related to motion blur, as I've noticed a lot of members of this forum have very bad performing monitors)
There's a compromise between PPI (pixels per inch) and high refresh rate however (unless you go laptop, which is a class of it's own)
The 1080p monitors are still overall faster than most 1440p monitors at the same refresh rate (unless OLED)
4K 240hz with the arrival of LG 32GS95UE is an option now, but usual OLED issues remain.
DisplayHDR400 is also a certificate you could keep in mind, it is a sign that the monitor is true 8bit capable (but it's not 100% correct at times)
Keep brightness at around ambient levels, you don't need to enforce 500 nits (cd/m2) in dark rooms, try aiming for 50-150nits for daily usage (and try looking for a GSync module it's a sign the panel isn't employing PWM dimming for brightness dimming. Freesync certs are not consistent)
If you don't want blue light affecting your sleeping schedule, consider investing in blue light glasses to remedy this (could be an issue as u're altering optics of eyes over just changing blue in monitor OSD)
There are also a few studies linked to worsening of eyesight when exposed to blue light with continuous use) or use the in-built blue light filter found in monitors above.
Personally, if it was strictly for gaming, I'd go for at least 240hz
I hope I've managed to narrow down the wide choice of monitors.