Now I only got one eye, just you wait.
the destruction of reason, civilization, and the power of intellect
he is warning Jack about the consequences of his actions, highlighting Piggy's vulnerability and his growing sense of anger and resentment glasses are symbolic of his ability to reason and see clearly
represent his loss of sight, which metaphorically represents his inability to see the true nature of the situation on the island and the escalating savagery of the boy