It is a sign of civilization and back home, non-savage like all the other boys are becoming.
Simon retrieved Piggy's glasses for him, after they had fallen onto the rocks as a result of Jack punching Piggy.
In the novel "Lord of the Flies" by William Golding, Piggy's glasses are broken when Jack slaps him, causing the glasses to fall off and shatter. The breaking of Piggy's glasses is symbolic of the deterioration of order and civilization on the island.
Simon
First Jack drops them and ends up breaking a lens, then toward the end of the book Jack's group comes and takes them.
jack has taken everything from everyone already so why would he have to take glasses that wont help him in anyway.
Glasses reflect light because of their smooth and polished surfaces. When light hits the surface of the glasses, it bounces off in a predictable way, creating a reflection. This reflection allows us to see objects clearly through the glasses.
Piggy's glasses symbolise technology and science, they are also an outward indication of Piggy's intelligence. The glasses are the technology which provides the boys with fire. Piggy's spectacles are also the means by which Piggy is able to see clearly, both in reality and metaphorically.
His portraits and statues do not reflect that he does.
They cut wood and then used Piggy's glasses to reflect the sun so the wood would catch fire.
You need glasses to correct your vision. If you can't see far or close distances, glasses help you. They reflect how the image bounces off your eye.
They decide to let the fire go out at night and light it again in the morning
Glasses can reflect light to some extent depending on their material and coating. However, their main function is to refract or bend light to help focus it properly on the retina to improve vision.