Question

why does he have to wear thick glasses

Answer 1

The thickness of glasses lenses depends on the power of the lens. People who have very thick lenses they have rather poor vision and need a higher power lens to correct it. Some people's have very thick eye glasses because they want to look different with the thick glasses from others due to the design of their glasses.

Answer 2

Explanation:

The thick glasses can protect us from the dust particles that are present in the atmosphere. The thickness of the lenses make sure to protect our eyes against the adversaries. It is understood that the people who wear thick lenses have poor vision and hence they should wear higher power to correct it. However, some people choose thick glasses because they want to look different.