It certainly reduces the blue light, which gets a good rating from me. However, before I applied the Ocushield, I had an anti-reflective surface on my monitor screen, which I have now lost to the reflective surface of the Ocushield. So I'm having to deal with a different kind of reflected light now which is irritating. Is there any way that the surface of the Ocushield can be made non-reflective? I was also disappointed that I have a 21" screen and I bought the Ocushield for a 21"screen, but I still had to cut it down to fit correctly. It would have been nice to have been able to fit it immediately without all the faff of cutting.