There has been a long standing issue with Apple laptops where the keyboard damages the screen. The screen and keyboard are so close together when the screen is closed that it doesn't take much pressure to get the two to rub. This causes keyboard marks on the screen that can't be removed.

There could be other issues with the screen coating but a lot of the pics on this site look like keyboard damage. You need to be very careful about putting pressure on the screen while it's closed.