My new glasses had a blue light filter on them and I didn't know it. I can definitely say that I have an easier time falling asleep / having my eyes feel not strained because of it. For a year or so by now, I turn on the night light on my computer anyway, and that helps too. I am a programmer so I stare at the screen the whole day. It doesn't matter if it is placebo because I do feel the benefit and that's all I care about.