Does PWM dimming cause headaches?

Updated 2026-11-02

Quick answerPWM dimming rapidly switches backlight power and can produce invisible flicker that some people notice as eyestrain or headache. Evidence specifically tying PWM to migraine is limited. Try DC-dimming displays or higher brightness plus software dimming; extensions cannot disable panel PWM.
Not medical advice. Migraine Mode is a screen-comfort tool, not a medical device. It does not diagnose or treat disease. When to see a doctor.

See

  • /pwm-dimming/
  • /how-to/reduce-flicker/

FAQ

How do I know my monitor uses PWM?

Manufacturer specs or independent flicker tests; phone cameras sometimes show banding.

Is 0% brightness safest?

Not if it increases PWM aggressiveness — personal testing required.

Sources

  • Miller NJ, Irvin L, Royer M, Strachan C. Visibility and annoyance of the phantom array effect varies with age and history of migraine. Lighting Res Technol, 2024. Link
  • Critical flicker frequency in migraine. A controlled study in patients without prophylactic therapy. Cephalalgia, 2005 (PubMed 15839848). Link
  • Headache related to a specific screen flickering frequency band (case report). Cephalalgia, 2004. Link

Not a medical device and not medical advice. Migraine Mode is a screen-comfort tool: it does not diagnose, treat, cure or prevent migraine or any other condition, and it does not replace a doctor. Its settings are based on studies of light, colour, flicker, patterns and motion; the extension itself has not been clinically tested. When to see a doctor.