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In addition to these numbers designating the eye size, bridge size and temple length of the frame, you may see other numbers, letters and words stamped on the inside of the frame. Often a small square (rather than a dash) will separate the eye size and the bridge size on the frame.
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Temple lengths generally range from 120 mm to 150 mm. In this case, the temple length is 140 mm. The third number - the temple length - is the length of the "stems" of the frame, measured from the frame hinge to the back tip of the temple. In most cases, the bridge size of eyeglass frames ranges from 14 mm to 24 mm. In this case, the frame bridge is 19 mm wide. The second number - the bridge size - is the distance between the lenses, which also is the size of the "bridge" of the frame that rests on your nose. Generally, the eye size of most eyeglass frames will range from 40 mm to 62 mm. In this case, the openings in the frame for the lenses are 48 mm wide. The first number - the eye size - represents the horizontal width of the lenses. The bridge size (distance between the lenses)Īll three of these measurements are specified in millimeters (mm).įor example, let's say you see these three numbers on the inside of your frames: 48-19-140.
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