The circumference of the edged lens is called?

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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

The circumference of the edged lens is called?

Explanation:
The key idea is that the edge length around a finished lens—the perimeter that sits against the frame—is labeled as the C-size. This designation specifically describes the outer boundary that defines how the lens fits into the frame, i.e., its circumference. The other size designations refer to different, non-perimeter aspects of the lens edging, so they don’t describe the outer edge length. Therefore, the C-size is the term that best matches the circumference of the edged lens.

The key idea is that the edge length around a finished lens—the perimeter that sits against the frame—is labeled as the C-size. This designation specifically describes the outer boundary that defines how the lens fits into the frame, i.e., its circumference. The other size designations refer to different, non-perimeter aspects of the lens edging, so they don’t describe the outer edge length. Therefore, the C-size is the term that best matches the circumference of the edged lens.

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