The flies probably symbolise the boys. While the insect flies are attracted to and cluster around the pigs head and the metaphorical evil which it represents the symbolic flies (the boys) cluster around Jack and the real evil which he represents.
Piggy was the one who wore glasses because he symbolized the intelligent people in society.
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asthma
In "Lord of the Flies," the character named Piggy finds the conch.
Piggy finds the spectacles in Lord of the Flies. He uses them to start the signal fire and later relies on them to see clearly.
Piggy in "Lord of the Flies" does not have a specific disease. He is portrayed as overweight, asthmatic, and socially awkward, but his character does not explicitly have a mentioned disease.