Not that I noticed, but I don't run reports on it and check that closely. Doesn't appear to make much differenceI really like the blue light filter.
Does it use more battery?
Less bright screen, good for night time. I like itI haven't tried it, what does it do?
It blocks some kinda glare you get from screen light that mess with your sleep if exposed to it to much before bed time, use it last 2 hours of the day if you're on your on the phone a lot