Which measurement describes the distance between the centers of the two lenses?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which measurement describes the distance between the centers of the two lenses?

Explanation:
Frame PD is the distance between the centers of the two lenses in the frames. This measurement ensures the optical centers align with your pupils when the lenses are mounted, which is essential for accurate vision and comfortable wear, especially with higher prescriptions or progressive lenses. The other options aren’t standard terms for describing the spacing between lens centers—geometric center isn’t a defined frame measurement, a generic “A Measurement” is vague, and while some jargon uses DBL in frame specs, frame PD is the established term for this specific distance.

Frame PD is the distance between the centers of the two lenses in the frames. This measurement ensures the optical centers align with your pupils when the lenses are mounted, which is essential for accurate vision and comfortable wear, especially with higher prescriptions or progressive lenses. The other options aren’t standard terms for describing the spacing between lens centers—geometric center isn’t a defined frame measurement, a generic “A Measurement” is vague, and while some jargon uses DBL in frame specs, frame PD is the established term for this specific distance.

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