On the back of spectacle frames, figures such as 46x22 represent what?

The figures found on the back of spectacle frames, such as 46x22, indicate specific measurements related to the lenses and bridge of the glasses. The first number, 46, typically refers to the lens width measured in millimeters, which is crucial for determining how the lenses will fit the wearer's face and align with their eyes. The second number, 22, signifies the bridge size, also in millimeters, which is the distance between the two lenses where the frame rests on the nose.

Understanding these measurements is essential for proper fitting, ensuring that the glasses not only provide clear vision but also comfort and stability when worn. Focusing on these numbers helps opticians customize and select frames that best suit an individual’s facial structure and visual needs, enhancing overall functionality and aesthetic appeal in eyewear.