Hey everyone,

I wanted to share my 4-month experiment testing 7 different devices to find a setup that actually respects eye health and brain comfort. Using a display that hurts your eyes—even for just 5 minutes—can ruin your entire day. The eye strain, burning sensation, and brain fog don't go away the moment you put the phone down; your brain needs hours (sometimes days) to recover.

The Devices I Tested

Over the past 4 months, I cycled through:

1. Samsung Galaxy S26
2. iPhone 13 Pro Max
3. Tecno Camon 20S Pro 5G
4. Redmi 15
5. Huawei Y9s
6. Infinix Note 30 (Running Custom ROM: Evolution X)

The Journey & The Unseen "Enemies"

• The PWM Nightmare (Samsung & iPhone): OLED displays on the Samsung S26 and iPhone 13 Pro Max were by far the worst. They caused burning eyes, tearing, and a distinct brain fog feeling (literally felt like my brain was a walnut rattling inside my skull for a day and a half).
• Escaping to LCD (Huawei Y9s): Like many here, I fled to an older LCD device hoping for salvation. While it was better, my eyes were still straining. That’s when I realized the second enemy: 60Hz refresh rate. (Unfortunately, most laptops still run on 60Hz as well).
• The Refresh Rate Switching Trap (Infinix, Techno, Redmi): Moving to 90Hz/120Hz LCD/AMOLED phones helped, but I was still getting subtle headaches. I realized there was a hidden, aggressive villain: Dynamic Refresh Rate Switching. Companies secretly drop your refresh rate from 120Hz/90Hz down to 60Hz the moment the screen becomes static—all under the guise of "battery saving." That constant, imperceptible jump between frequencies strains the eye muscles terribly. Trying to force a constant rate via standard ADB commands didn't work, as Android silently overrode my settings.

The Science & The Golden Rules

Comfort isn't tied to a specific brand; it’s tied to display technology and consistency. Here is what I learned:

1. LCD is still king for zero PWM, but it MUST be combined with high, steady refresh rates (at least 90Hz).
2. If using AMOLED: Look for PWM dimming frequencies above 1940Hz, combined strictly with LTPO panels. (Avoid LTPS panels as their transition between 60Hz and high refresh rates is slow, jarring, and hurtful to the eyes. LTPO switches much faster and smoother).
3. LOCKED Refresh Rate is Non-Negotiable: Your display must stay at a single frequency 100% of the time, regardless of interaction or battery level.

The Final "Recipe" & Salvation

I finally solved the puzzle by installing a Custom ROM (Evolution X) on the Infinix Note 30 (which has a 120Hz LCD display).

Why this combination worked:

• Forced 90Hz Everywhere: Evolution X allowed me to hard-lock the screen to a strict 90Hz minimum and 90Hz maximum across all states (even on low battery).
• The Battery Myth Busted: The battery drain from forcing a constant 90Hz is negligible. It is absurd that manufacturers silently drop refresh rates to 60Hz behind the user's back just to save a tiny fraction of power.
• Bonus Perks: Beyond curing my eye strain, the custom ROM fixed Infinix’s notorious delayed notifications, provided ultra-smooth UI performance, added lock-screen charging wattage (like Samsung), and retained both fast charging and full camera resolution.

Takeaway

Don't just look at PWM frequency—watch out for micro-stuttering caused by dynamic refresh rate switching! Locking a good LCD panel to a fixed 90Hz brought my eyes and brain back to peace.

Hope this helps anyone struggling out there! Happy to answer any questions about the setup
Greetings to you all from Iraq! 🇮🇶 Stay safe and keep your eyes healthy.

-iPhone 13 (610hz allegedly)

-iPhone 12 (480hz)

-Galaxy S21 FE (240hz)

What settings in iPhone / iPad / iOS can be adjusted to reduce eye strain and dizziness? Have u found anything that helps?