The measurement used to describe the size of the lens itself is called which?

• A. Eyesize
• B. Lens Size
• C. A Measurement
• D. Dbl

Answer: (B)

The key idea is that the size of a single lens is its width, measured in millimeters. This horizontal dimension describes how large each lens is and is what you see as the first number in frame size notations like 52-18-140. In this question, that measurement is referred to as the lens size, which is the exact term used to describe the size of the lens itself. While eye size is a common synonym for the same dimension, the option given aligns with the phrasing used here. The other choices are either too vague or refer to other parts of the frame (like the bridge) rather than the lens width.