Certified Paraoptometric (CPO) Practice Exam 2025

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

Effective diameter
Optimal diameter
Standard diameter
Measured diameter

The correct answer is: Effective diameter

The correct term for the largest diameter through the lens is the effective diameter. This term refers to the diameter that is most relevant for determining the optical properties of the lens. The effective diameter is significant because it influences both lens performance and optical calculations, such as those related to the lens's focal point and image quality. It is commonly used in optical manufacturing and fitting, ensuring that lenses perform adequately in vision correction. The other terms do not accurately describe this specific measurement; they may refer to various other dimensions or characteristics of a lens, but they do not align with the established terminology used to denote the largest diameter. Understanding these distinctions is crucial in the context of optics and helping patients achieve the best vision through correctly specified lenses.