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      Most sunglasses always include the specification printed on the left temple. It's important to understand these numbers since they are reference numbers for your next purchase to ensure a perfect fit. In case you want to replace your sunglass lenses, these numbers are indispensable for lens replacement. If you plan to buy online your new shades, the first thing you need to know what size fits perfectly on you. 

      Eyewear companies usually use the same number code to specify their model and three typical dimensions: lens width, bridge width, and temple length. These dimensions are following the metric system, always in millimeters.

      Numbers on sunglasses

      Model number - Color codes - Lens width □ Bridge width - Temple length.

      Model numberpart number code from manufactures. For example, RB stands for Ray-Ban, VO stands for Vogue sunglasses.

      Color codes: specify frame and lens color. For example 001/58. 001 means black metal frame, 58 means green polarized lenses.

      Lens width: the horizontal dimension of the lens. Depend on the sunglasses styles, this measurement varies from 48 to 62 millimeters.

      Bridge width: the bridge length or distance between two lenses, varying from 12 to 16 millimeters.

      Temple length: a dimension of sunglass arm or temple including the temple tip. This dimension controls a secure fit around your ears. It normally comes in measurements: 135, 140, 145, and 150 millimeters.

      Some manufacturers indicate category on the sunglasses arm: 2 for medium tint, 3 for dark tint, and 4 for very dark tint. Ray-Ban brand specifies 3P, that means dark tint polarized lenses. 

      Product coding on sunglasses temples

      Let encode the numbers RB2140 901 58 52 □ 20 3P printed on the left arm of Ray-Ban sunglasses.

      • RB2140: RB is the code for Ray-Ban brand, 2140 is the model number for wayfarer style.
      • 901 58: 901 is code for black acetate, and 58 is code for green lenses with a polarized feature.
      • 52 □ 20: 52 is the width of each lens measured from both sides, and 20 is the bridge length.
      • 3P : 3 means sunglasses belong to category 3 (general condition), and P means polarized lenses.

      To have deeply understood these numbers will help you make an informed decision when searching online for a new pair of sunglasses.