# Frame Size Guide ## Understanding Eyeglass Frame Measurements Choosing the correct frame size is important for both comfort and appearance. Most eyeglass and sunglass frames have measurements printed on the inside of the temple arm. A typical frame size may look like this: **48 □ 22 145** These numbers represent: * **Lens Width:** 48mm * **Bridge Width:** 22mm * **Temple Length:** 145mm ## Lens Width The lens width is the horizontal width of a single lens measured in millimetres. General guide: * Small: 40–48mm * Medium: 49–54mm * Large: 55mm+ ## Bridge Width The bridge width is the distance between the two lenses and determines how the frame sits on your nose. General guide: * Narrow Fit: 14–18mm * Standard Fit: 19–22mm * Wide Fit: 23mm+ ## Temple Length The temple length is the length of the arms that extend behind your ears. Common sizes: * 135mm * 140mm * 145mm * 150mm ## Frame Width Frame width is the total width of the frame from hinge to hinge. Approximate guide: * Small Face: Under 130mm * Medium Face: 130–140mm * Large Face: Over 140mm ## How to Measure Your Existing Glasses The easiest way to find your size is to check a pair of glasses that already fit you well. Look inside the temple arm for numbers similar to: **50 □ 20 145** These measurements can be used as a reference when shopping for vintage eyewear. ## Vintage Frame Sizing Many vintage frames were produced before modern sizing standards became common. Some older frames may not have size markings, and measurements may vary slightly from modern eyewear. At 20th Century Specs, we provide measurements for each frame wherever possible to help customers make an informed purchase. ## Tips for Choosing the Right Size ### If You Have a Narrow Face Consider: * Smaller lens widths * Narrow bridge measurements * Compact frame shapes ### If You Have a Wider Face Consider: * Larger lens widths * Wider bridges * Broader frame fronts ### If You Are Unsure Compare the measurements of a frame you already own with the measurements provided in our product listings. ## Need Help? If you have questions about sizing, fit, or measurements, please contact us before placing your order. We are happy to help you find a vintage frame that suits your needs.