In chapter 10: the Shell and the Glasses Jack selected Roger and Maurice to accompany him on his raid to 'get fire' from Ralph's group, in fact they stole Piggy's glasses
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Later in the book, after a raid, he brings them back to castle rock in order to make his own fire using the glasses so that he may have a feast
First Jack drops them and ends up breaking a lens, then toward the end of the book Jack's group comes and takes them.
Simon retrieved Piggy's glasses for him, after they had fallen onto the rocks as a result of Jack punching Piggy.
jack has taken everything from everyone already so why would he have to take glasses that wont help him in anyway.
In piggys asswhole
he is very sad and cries at the end of the book because of piggys death