Weird Grid on top of MBP screen?

hi,
wiped mbp screen had couple of fingerprints on it, , noticed weird grid thing on top of screen.

runs top of screen 2 inches down. can feel fingernail if run on it.

here's picture it's bit more prominent in real life:


(click enlarge)

it's noticeable when cleaning i'm not worried, wondered was!

edit: update 2015 below.

 

if can feel , it's on glass, have apple replace top lid if computer still under warranty. if not, either live it, replace glass yourself.

 

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