American Board of Opticianry (ABO) Practice Test 2026 - Free ABO Practice Questions and Study Guide

Question: 1 / 400

What is the material that filters the least UV radiation?

Crown Glass

Crown Glass is the material that filters the least UV radiation compared to the other options. Crown Glass has a lower inherent UV protection compared to modern lens materials like CR-39, Polycarbonate, and Trivex. This is because Crown Glass does not have UV-blocking properties built into the material itself and requires additional coatings to provide adequate UV protection. On the other hand, CR-39, Polycarbonate, and Trivex have intrinsic UV protection due to the nature of their composition, making them more efficient at blocking UV radiation without the need for additional coatings.

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CR-39

Polycarbonate

Trivex

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