In frame markings, what does the second number represent?

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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

In frame markings, what does the second number represent?

Explanation:
In frame markings, the middle measurement is the bridge width—the distance between the two lenses at the nose area, measured in millimeters. This dimension determines how the frame sits on your nose: a bridge that’s too small will pinch, while one that’s too large can slide. The first number is the lens width (eye size) and the last is the temple length; the vertical frame height isn’t part of this three-number code.

In frame markings, the middle measurement is the bridge width—the distance between the two lenses at the nose area, measured in millimeters. This dimension determines how the frame sits on your nose: a bridge that’s too small will pinch, while one that’s too large can slide. The first number is the lens width (eye size) and the last is the temple length; the vertical frame height isn’t part of this three-number code.

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