American Board of Opticianry (ABO) Practice Test

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Prepare for the ABO certification with our comprehensive test preparation resources. Engage with interactive quizzes and detailed questions created specifically for the ABO exam. Enhance your understanding of opticianry concepts and ace your certification test!

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What is the material that filters the least UV radiation?

Crown Glass
CR-39
Polycarbonate
Trivex

The correct answer is: 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.