What Do the Size Numbers Mean on Eyeglass Frames?
Eyeglass frames have a series of 3 numbers imprinted either on the inside of the frame's temple or inside the bridge (across the nose piece). These eyewear size numbers are always in millimeters. The eyeglass numbers are usually written as: 49-19-135 or they might have small boxes between the numbers on the eyeglass frame.
Components of Frame Size
In the example shown to the right, the frame size numbers are: 52-17-140.
 1. Eye Size: The first number is the distance across one lens of the eyeglass frame (not including the frame) measured from outermost edges of lenses horizontally.
Eye Size is typically between 40 mil. - 62 mil.
2. Bridge Size: The second number is the distance across the bridge on the eyeglass frame (the distance between lenses).
Bridge Size is typically between 14 mil. - 24 mil.
3. Temple Size: The third number is the length of the temple (also know as the arm piece or ear piece) from the front of the eyeglass frame to the end of the temple, which goes behind the ear.
Temple Size is typically between 120 mil. - 150 mil.
If you are looking for eyeglass frames and you already wear glasses, you should check the numbers in your exsisting eyeglass frame and find frames with similar numbers. The numbers don't have to match exactly, but choosing frames with numbers that are very different may result in an uncomfortable fit. If you don't currently wear glasses, or your current glasses are not comfortable, you can go to an optical store, try on some eyeglass frames and copy down the sizes of the frames that are most comfortable.
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