After scrutinising my iPhone 7 screen for the usual things (dead/stuck pixels, backlight bleed etc) I've noticed a new (for me) phenomenon... With a bright background (Settings App or a blank Safari tab) I can see faint lines over the entire screen. They don't appear to be on the LCD itself but almost like its in the glass or the olephobic coating as it sort of 'moves' if I move the phone around. I've tried to photograph it but its not picking up on a camera. I've compared the screen to that on my 6 which sort of has the same effect but much less noticeable, this is like theres a constant layer of grease or something over the screen. Just wondering if anyone's seeing the same thing or if I'm going mad?! To test, turn up the brightness and go in to General within Settings. and holding the phone 20-30cm away focus on the background and begin to tilt the phone, it then looks as though there's a fine mesh over the screen and you begin to see these flickery vertical lines. Not sure what the cause is or if it's considered normal? I know on the older phones you used to be able to see the touch layer as a fine grid over the screen at certain angles/lighting, and if what I'm seeing here is the same sort of thing in one of the laminated layers?