Question 1

Where are sunglasses frame measurements printed?

Accepted Answer

Most sunglasses and eyeglass frames print three numbers separated by dashes or dots on the inside of the left temple arm — for example, 52-18-145. The first number (52) is the lens width in millimeters, the second number (18) is the bridge width between the lenses, and the third number (145) is the temple arm length. Some frames also include a fourth number for the overall frame height, and these measurements are the most reliable way to compare frames without trying them on in person.

Question 2

How wide should sunglasses be?

Accepted Answer

The total frame width should closely match your face width measured across the temples, without squeezing the sides of your head or extending more than a few millimeters beyond your face on either side. If the frame is narrower than your face, it will pinch your temples and may cause headaches over extended wear. If it is significantly wider, the sunglasses are likely to slide down your nose and feel loose, especially when you look down or move your head quickly.

Question 3

Does lens width equal total frame width?

Accepted Answer

No, a single lens width does not equal the total frame width. The overall frame width includes both lenses plus the bridge width and the frame material on each side, so it is always wider than the lens measurement alone. For example, a frame with 52 mm lenses and an 18 mm bridge has a total width of approximately 52 + 18 + 52 = 122 mm before adding the outer frame edges, which can add another 5 to 10 mm on each side depending on the frame style and material thickness.

Face Width	Frame	Lens	Bridge	Temple
Narrow face	Small	47-50 mm	14-18 mm	135-140 mm
Medium face	Medium	51-54 mm	16-20 mm	140-145 mm
Wide face	Large	55-58 mm	18-22 mm	145-150 mm
Extra wide face	XL	59+ mm	20-24 mm	150+ mm

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