How to Measure Sunglasses You Already Own

What you need

A millimeter ruler is ideal because eyewear measurements are usually listed in millimeters. Place the sunglasses on a flat surface and measure carefully without bending the frame. Keep your reference pair nearby while browsing so you can compare more than one dimension.

1. Measure the overall frame width

Measure straight across the front of the sunglasses from the widest outer point on one side to the widest outer point on the other. This gives you a practical sense of how much space the frame takes up across your face.

Overall frame width is especially useful when comparing frames that look very different in photos. A narrow oval frame and a bold square frame may have similar lens widths but very different total proportions.

2. Measure the lens width

Measure one lens horizontally at its widest point. Do not include the frame around it. This number is often one of the measurements printed inside a temple or listed by eyewear brands.

Lens width is helpful, but it should not be used alone. Bridge width, frame construction and total front width can change how two frames with similar lens widths actually feel.

3. Measure the bridge width

The bridge width is the distance between the two lenses at the narrowest point between them. This area affects how the frame sits around the nose, but bridge construction also matters. A molded bridge and adjustable nose pads can behave differently even when the listed number looks similar.

4. Measure the temple length

Measure along the temple from the hinge toward the tip. If the temple curves strongly behind the ear, follow the general length of the arm rather than measuring a diagonal shortcut.

Temple length is only one part of side comfort. The angle of the hinge and the way the temple curves also influence how a frame sits.

5. Measure the lens height when it is available

Lens height is measured vertically at the tallest point of one lens. It is particularly useful for understanding how much visual space a frame may occupy on the face. This can help distinguish a compact square shape from a larger oversized square shape.

How to compare your numbers with a new pair

Start with the measurement that best describes what you like about your current frame. If you mainly care about overall scale, compare total frame width first. If you know your current bridge feels particularly comfortable, compare bridge construction and width as well.

The closer the new measurements are to your comfortable pair, the easier it is to estimate size. That does not mean the new sunglasses will feel identical: shape, material, nose support and temple design can all change the fit.

Do not use model photos as your only size reference

Model photography is useful for styling and proportion, but faces vary. Camera distance, angle and lens choice also affect how large a frame appears. Treat model images as visual inspiration, then confirm the actual dimensions before buying.

Your five-number comparison checklist

• Overall frame width
• Lens width
• Bridge width
• Temple length
• Lens height (when available)

Next step: compare measurements with DESSON frames

When DESSON measurements are listed on a product page, compare them with a pair you already own and like. If a measurement is missing, contact us before choosing. We would rather help you compare the frame than ask you to guess.

How should sunglasses fit? Then Shop All Frames.