Updated August 2026 Blue light filtering has moved from computer glasses to phone accessories, and screen protectors with built-in blue light filters are now a standard option in most major lineups. The pitch is appealing: protect your screen and your eyes at the same time. The honest picture is more nuanced. Blue light filters are real, the filtering they do is measurable, and some of their benefits are plausible. But the science on the most advertised claim, better sleep, is genuinely mixed, and some marketing in this category runs far ahead of the evidence. Here is what these protectors actually...