The Apple light on my Macbook is damaged, could this damage the screen? My Macbook was hit  by my keys and crack the apple light on the back.



If I don't repair it, could this damage the sceen? The cover of Macbook is so thin that I really worry about this, but repair could be troublesome and expensive so I'd rather not have to fix it.
Essentially it is not a light but is simply a hole covered with a piece of plastic. LED which are used as your screen backlight serve as the actual light for the apple mark, so the apple mark is not lit on when the screen is not lit on.

In short, a crack in Apple mark will is not going to influence your Macbook in any way.