SCIENCE5 MIN READ
Blue-light, explained
What the screen-time filters actually do, and when they're worth it.
Editorial Team·30 May 2026
Blue-light explained
Blue-light coatings filter a slice of the high-energy visible spectrum. The evidence on sleep is promising; the evidence on eye strain is mixed.
Our take: if you spend long days on screens, a light filter costs little and can't hurt.
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