You mean the screen image/quality? It doesn't diminish the quality that much for average applications and images. BUT, if you're watching HD movies or Netflix, you'll see some wavy lines. It's like if you were to take plastic wrap and put it over your screen. Honestly, it's not that bad. It's not as clear as the VZ/stock protector, but it's rubberized, so fingerprints simply don't appear. Seriously, I've maybe cleaned the screen 3 times since I had it put on, whereas I had to clean my VZ protectors several times a day.