Certified Paraoptometric (CPO) Practice Exam 2025 - Free Paraoptometric Practice Questions and Study Guide

Question: 1 / 420

Which lens material is typically less scratch-resistant than glass?

CR-39

CR-39 is indeed typically less scratch-resistant than glass. It is a plastic material that is lightweight and offers good optical clarity, but it does not have the same level of hardness as glass, making it more susceptible to scratches.

While polycarbonate and Trivex also offer significant advantages like impact resistance, they too are less scratch-resistant compared to glass unless they are treated with a hard coating. Glass lenses, on the other hand, have a more durable surface that is less prone to scratching, which makes them ideal for those who prioritize scratch resistance in their eyewear.

This understanding of lens materials and their respective properties is essential for ensuring that patients receive the most suitable eyewear based on their needs and lifestyle.

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Polycarbonate

Trivex

Glass

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