Screen health guides
Deep dives on PWM flicker, blue light, and display comfort. Written from the research, for people whose eyes notice the difference.
PWM Flicker, Eye Strain, and Headaches: What to Do
What pulse-width modulation flicker is, why it causes eye strain and headaches for some people, and how to reduce it.
OLED PWM Dimming and Eye Strain: Why OLED Screens Flicker
Why OLED panels pulse at low brightness, whether the flicker stops at full brightness, and what reduces it on a screen you already own.
Laptop PWM Flicker: How to Check It and Reduce Eye Strain
How to test your laptop screen for PWM flicker and reduce its impact without replacing your hardware.
PWM Dimming Frequency for Late-Night Coding: What You Can Tune
Whether Mac, Windows or Linux lets you change PWM frequency, and the brightness setup that keeps the backlight steady while you code at night.
Do MacBooks Use PWM? MacBook Air, MacBook Pro and Apple Display Flicker
Which MacBooks are measured with PWM, how temporal dithering differs, and what helps on macOS.
The Best Screen and Background Color for Your Eyes, Day and Night
Which background and text colours are easiest to read, the contrast to aim for, and the pairs to avoid.
HP EliteBook 830 G9 PWM Flicker: Which Display Option Flickers?
The four 830 G9 screens compared: which one measured flicker-free, why the Sure View option is the risk, and how to identify yours.
Blue Light Filter for Sleep: Does It Actually Help?
What the research says about blue light filtering and sleep quality, and how to set up your evenings.
PWM Frequency: What Hz Is Safe?
What 240 Hz, 480 Hz, 1,920 Hz and 3,840 Hz PWM mean, modulation depth, and how to read review numbers.
DC Dimming vs PWM
How DC dimming differs from PWM, its trade-offs, which devices offer it, and what laptop "DC mode" means.
When to Use a Blue Light Filter
All day, at night, or from sunset? A daily schedule for screen warmth that works with your body clock.
Morning Light and Your Circadian Rhythm
How much morning light you need, how long to get outside, light boxes, and whether a screen counts.
Screen Settings for Light-Sensitive Eyes
Brightness, contrast, flicker, colour and glare settings for people whose eyes are sensitive to screen light.
PC Screen Dimmer Software for Mac and Windows
Dimming below your display's minimum brightness: how software dimmers work and when you need one.
7 Best Blue Light Filter Software in 2026
Ranked by circadian effectiveness: the tools that actually shift your evening light exposure, compared.