Certified Paraoptometric Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

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.