Reduced EMF radiation which is more important!
I actually have a meter I bought a few years ago to test EMF radiation off of my old cell phone which has now been identified as a likely cause of physical ailments including cancer of the brain, or any other body parts it comes in contact with. Anyway, I tested the screen side of my kid's cell phone and it reduced the radiation by quite a bit! Does it protect my glass screen? So far so good but time will tell.