Flicker
Flicker is rapid variation in light output caused by device electronics. Buyers should care because it can affect comfort, confidence, and long-session usability, especially in products used near the face.
Why buyers should care
Daily-use products should not rely on vague comfort claims when the electrical behavior is unclear. Flicker matters most when the device is used regularly and near the eyes.
How brands misuse it
A brand may say flicker-free without clarifying how it was tested, under what brightness level, or whether the claim applies across normal use settings.