American Board of Opticianry (ABO) Practice Test 2026 – The All-in-One Guide to Master the American Board of Opticianry Exam!

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What term is used for a unit of measurement for ophthalmic prism?

Antireflection

34mm

Diopters

Diopters are the unit of measurement for ophthalmic prism, while the other options are not related to this specific measurement. Antireflection is a coating used to reduce glare on lenses, 34mm is a measurement of lens diameter, and Colmascope is a medical instrument used for analyzing the eye. These options are not typically used as units of measurement for ophthalmic prism. Therefore, Option C is the best choice for this question.

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Colmascope