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Contact lens material identification: “Perspex” is the commercial name for which polymer used historically in optical applications?

Difficulty: Easy

Polymethyl methacrylate (PMMA)
Polystyrene (PS)
Unsaturated polyester
Polypropylene (PP)

Correct Answer: Polymethyl methacrylate (PMMA)

Explanation:

Introduction / Context:
Perspex, Lucite, and Plexiglass are trade names for PMMA, valued for optical clarity and biocompatibility in many lens and medical applications. Correct name recognition avoids material confusion with PS or PC.

Final Answer:
Polymethyl methacrylate (PMMA)

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