Certified Paraoptometric Practice Test

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Prepare for the Certified Paraoptometric Test! Study using flashcards, multiple choice questions, and detailed explanations. Get ready for your exam and boost your optometric skills!

Practice this question and more.

What is the term for the largest diameter through the lens?

Concave (-)
Effective diameter
Prism
sph/cylindrical

The correct answer is: Effective diameter

The term for the largest diameter through the lens is called the effective diameter. This is because it refers to the actual size of the lens opening and is not influenced by the shape of the lens. Option A is incorrect because a concave lens is not measured by its diameter, but rather by its focal length. Option C is incorrect because a prism is not a type of lens. Option D is incorrect because sph/cylindrical is a measurement notation and does not refer to the overall size of the lens. Therefore, option B is the most appropriate and precise choice for the given question.