Glasses Frame Size Measurements

Glasses Frame Measurement Guide

If you look inside your glasses, there are usually three numbers stamped on the inside of the frame. These numbers will usually appear on the inner surface of the frame temple and will look something like “54-20-140.” These three numbers are key measurements that help describe your eyeglass size to measure up to your face. The first number, in this case, “54”, is the eye size. The second number “20” is the bridge size – meaning the distance between the lenses, and the third number “140” is the temple length.
All of these three different measurements are specified in millimeters (mm).The first number represents the eye size and is the horizontal width of the lenses. In this case, the openings in the frame for the lenses are 54 mm wide. Typically, the eye size of most eyeglass and sunglass frames range from 40 mm to 62 mm.The second number represents the bridge size and is the length of the “stems” of the frame. This number is the size of the bridge of the frame that will sit on your nose. The bridge size will typically range from 14 mm to 24 mm.

The third number represents the temple length and is the length of the stems of the frame. This number is measured from the frame hinge to the back tip of the temple. The temple lengths will range from 120 mm to 150 mm in size.

General Rules for Fitting Glasses For Your Face

  • Generally speaking, the top of your eyeglass and sunglass frames should be no higher than the line of your eyebrows.
  • The bridge and bridge size is crucial in order to gain a comfortable fit of the frames.
  • The lowest edge of the eyeglass and sunglass frames should not sit on your cheeks. By not having them rest on your cheeks, it will help prevent rubbing and irritation.
  • The size of the frames should be in proportionate to your face. If you have a large face, it’s better not to stick with petite glasses. If you have a small face, it’s best to not choose large glasses.
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