The term describing the distance between the lenses or bridge is which?

• A. A Measurement
• B. Frame PD
• C. Eyewidth
• D. Dbl

Answer: (D)

The distance between the lenses in a frame is described as the distance between lenses, abbreviated DBL. This measures the width of the bridge—the horizontal space across the nose between the two lenses, essentially the frame’s bridge width. It’s a specific frame measurement used to ensure the frame fits the nose area and positions the lenses correctly over the eyes.

This term differs from Frame PD, which relates to the pupillary distance or how the frame’s optical centers align with the wearer's pupils, and from generic terms like “A measurement” or “Eyewidth,” which aren’t standard frame-fit terms. The DBL specifically captures the nose-bridge width that determines how snugly the frame sits on the nose.