I think there's a difference in the screen when they're used....but it was rather hard for me to tell when the lights are on or sunlight is strong.  When it's night time and the lights are out, then they really help with the screen brightness and glare.  Kinda sucks that I just got a new pair of glasses and theses don't fit over them.... =_= I just switch over to the old pair... maybe one of these days I can figure out how to turn them into a clip on pair...good thing there's 2 of them :P Also found it hilarious that the included bag for the wraparounds actually don't really fit - the glasses end up sticking out a bit lol