Maggie Mills Rose
This is the rising action of the boys getting the idea to use piggy's glasses to start a fire. His glasses are the only technology the boys have. Creating fire brings them the idea to start a signal fire which represents rescue and going back to civilization.
One side of Piggy's glasses breaks after Jack throws them down. Since the boys are slowly losing their grasp on civilization the glasses breaking symbolizes the boys slowly breaking mentally.
The glasses represented civilization because the boys start to break up and loose their dignity. At first they used the glasses to start a fire, but now the glasses are used more than that. They have bad memories and experiences on them.