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DBL stands for Distance Between Lenses. It measures the space between the inner edges of the two lenses in an eyeglass frame, expressed in millimeters. This distance corresponds to the bridge size, the part that rests on your nose. DBL is usually printed inside the frame, next to lens width and temple length. Together, these numbers define frame size and help ensure a balanced, comfortable fit.
read more about DBL in optics ...DBL affects how well glasses sit on your face and how comfortably they balance across your nose and eyes.
Opticians measure DBL as the shortest distance between the inner edges of the lenses, just above the bridge. When combined with lens width, this determines the overall frame size. For example, a frame labeled 52?18?140 means a 52 mm lens width, an 18 mm DBL, and 140 mm temple arms. Accurate measurement ensures lenses align correctly in front of the eyes, promoting consistent clarity and comfort across different frame styles.
Incorrect DBL can lead to alignment and comfort problems. Frames that are too wide slide down easily, while narrow ones leave pressure marks on the nose. Misaligned lenses can cause slight vision distortion or fatigue. A properly fitted DBL distributes weight evenly, keeping lenses stable and aligned for clear, comfortable vision throughout the day.
During fitting, opticians can adjust bridge size by selecting different frame styles or using nose pads for finer spacing. Digital measurements also help confirm alignment before lenses are cut. Adjusting DBL ensures both comfort and optical precision, especially for high prescriptions or customized lens designs.
It's printed on the inside of the frame, usually between the lens width and temple length numbers.
Yes, DBL represents the bridge width of your frame.
Yes, an incorrect DBL can misalign lenses, affecting how your prescription performs.
When purchasing new glasses, ensure an optician verifies the Distance Between Lenses (DBL). A bridge that is too wide or too narrow can cause the glasses to slip or sit too high, leading to optical distortion and physical discomfort on the bridge of your nose.
Vision Council. How to Read Frame Measurements (thevisioncouncil.org). 2024.
All About Vision. Eyeglass Frame Sizes (allaboutvision.com). 2023.
Consumer Reports. Getting the Best Fit for Glasses (consumerreports.org). 2024.
ABDO. Spectacle Frame Measurements (abdo.org.uk). 2024.