Screen observation
A steady gray field supports camera notes; it cannot diagnose symptoms or measure optical PWM Hz.
Photo: Karola G / Pexels
Symptom limits
Glare, distance, dry eyes or vision issues may cause discomfort. Seek advice if symptoms persist.
Photo: MART PRODUCTION / Pexels
What PWM means
PWM varies on/off duty cycle; the waveform depends on the exact display, settings and mode.
Photo: SHVETS production / Pexels
Record conditions
Note device, mode and normal brightness. Never dim the display or keep viewing to provoke symptoms.
Photo: Aviz Media / Pexels
Static reference
The tool's steady gray field neither flashes nor moves lines, and does not access your camera.
Photo: MART PRODUCTION / Pexels
Camera limits
Exposure, rolling shutter and screen timing may hide/create bands; size or count cannot measure Hz.
Photo: SHVETS production / Pexels
Interpret cautiously
Hz alone omits depth and waveform; no number guarantees everyone's comfort or medical safety.
Photo: Karola G / Pexels
Comfort first
Use comfortable normal settings. Stop at discomfort; seek professional advice for lasting symptoms.
Photo: Arina Krasnikova / Pexels
Measurement limits
Measure with suitable optical tools and recorded conditions. No bands does not prove no PWM.
Photo: Tima Miroshnichenko / Pexels
Record an observation
Save bands/no-bands and settings. Neither result diagnoses or certifies flicker-free.
Photo: Tima Miroshnichenko / Pexels