What material is used to make high-index plastic lenses?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

What material is used to make high-index plastic lenses?

Explanation:
High-index plastic lenses are made from polymers that have a higher refractive index so lenses can be thinner and lighter for stronger prescriptions. Polycarbonate is a common high-index plastic used for spectacle lenses because it combines a relatively high index with excellent impact resistance, making it both thin and durable. Acrylic (PMMA) has a lower index and produces thicker lenses, while polyethylene and polyurethane are not standard primary lens materials in most ophthalmic lenses. So, the material best suited for high-index plastic lenses among these options is polycarbonate.

High-index plastic lenses are made from polymers that have a higher refractive index so lenses can be thinner and lighter for stronger prescriptions. Polycarbonate is a common high-index plastic used for spectacle lenses because it combines a relatively high index with excellent impact resistance, making it both thin and durable. Acrylic (PMMA) has a lower index and produces thicker lenses, while polyethylene and polyurethane are not standard primary lens materials in most ophthalmic lenses. So, the material best suited for high-index plastic lenses among these options is polycarbonate.

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