How do I know if sunglasses will fit my face?

Compare the frame’s total width to the distance across your own face at the temples. Lens width is the number quoted most often, and 50–55mm suits most average faces; under 48mm reads small and over 60mm oversized.

Sunglasses are sold with three measurements and most listings quote at least one, usually as something like 54–18–140. Those numbers are lens width, bridge width and arm length, all in millimeters, and together they tell you more than any photograph of a model can.

Lens width is the one that matters most. It is the horizontal width of one lens. Between roughly 50 and 55mm fits most adult faces; below about 48mm will read as deliberately small and above 60mm as oversized. Neither is wrong — they are style choices — but you should know which one you are buying.

The test you can do at home. Take a pair you already own and like, and find the numbers printed on the inside of one arm. That is your reference. Buying within a few millimeters of those figures is far more reliable than judging from a product shot, because models are photographed to flatter the frame.

The other two numbers. Bridge width is the gap between lenses; too narrow and the frame sits on your cheeks, too wide and it slides down. Arm length decides whether it reaches comfortably behind your ears. If a frame slides, metal frames with adjustable nose pads can be pinched in — plastic frames generally cannot.

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