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What the numbers mean on your sunglasses

Updated: Oct 5, 2023

When it comes to choosing the right sunglasses, there are many factors to consider, such as style, color, and UV protection. But one crucial aspect that is often overlooked is the size of the sunglasses. Sunglasses that are too big or too small can be uncomfortable, unflattering, and may not provide adequate protection. In this blog, we will discuss how to read the numbers on your sunglasses to ensure that you choose the right size.

Understanding Sunglass Measurements

Most sunglasses have a series of numbers printed on the inside of one of the arms. These numbers represent the measurements of the sunglasses and are usually displayed in millimeters (mm). Here are the three key measurements to look for:

  1. Lens Width: This is the horizontal width of the lens, measured in millimeters, from the widest point of one lens to the other. The lens width is an essential measurement to consider as it determines how well the sunglasses will cover your eyes and protect them from the sun.

  2. Bridge Width: This is the distance between the two lenses, measured in millimeters. The bridge width is important because it determines how well the sunglasses will fit on your nose. If the bridge is too wide or too narrow, the sunglasses may slide down or pinch your nose.

  3. Temple Length: This is the length of the arms of the sunglasses, measured in millimeters, from the hinge to the tip that rests behind your ear. The temple length is important as it determines how well the sunglasses will fit around your ears.

How to Choose the Right Size

To choose the right size of sunglasses, it's essential to consider the measurements above and compare them to your own facial features. Here are a few tips to help you choose the right size:

  1. Consider your face shape: Different face shapes require different sunglass sizes. For example, people with a small face should opt for smaller sunglasses, while people with a large face should go for larger sunglasses.

  2. Use a measuring tape: If you're unsure about the measurements, you can use a measuring tape to measure the distance between your temples, the width of your nose, and the length of your temples.

  3. Try them on: The best way to ensure that sunglasses fit well is to try them on. When trying on sunglasses, check that they don't slide down your nose, pinch your temples or ears, or feel too tight.


In conclusion, the numbers on your sunglasses represent important measurements that can help you choose the right size. The lens width, bridge width, and temple length are all crucial measurements to consider when selecting sunglasses that fit well and provide the right amount of protection. By understanding these measurements and comparing them to your facial features, you can find the perfect pair of sunglasses that not only look great but also feel comfortable and provide adequate protection for your eyes.

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