What is the term for the distance between the geometric centers?

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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

What is the term for the distance between the geometric centers?

Explanation:
The distance between the centers of the two lenses in a frame is called the frame PD. This measurement ensures the optical centers of the lenses line up with the wearer's pupils when the frame fits properly. It’s different from pupillary distance, which is the distance between the centers of the pupils themselves, and from other frame dimensions like the distance between lenses (DBL), which refers to the gap at the bridge. So the term that matches the description is frame PD.

The distance between the centers of the two lenses in a frame is called the frame PD. This measurement ensures the optical centers of the lenses line up with the wearer's pupils when the frame fits properly. It’s different from pupillary distance, which is the distance between the centers of the pupils themselves, and from other frame dimensions like the distance between lenses (DBL), which refers to the gap at the bridge. So the term that matches the description is frame PD.

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