Eyeglass Frame Size Guide
If you take a look on the inside of your current pair of you glasses, you may notice 3 sets of numbers.
Those set of numbers, are your frame’s measurements. All three frame
measurements are specified in millimeters (mm).
The first number, the eye size, is the horizontal width of the lenses.
Generally, the eye size of most frames will be 44 to 62 mm.
The second number, the bridge size, is the distance between the lenses. It's the size of the "bridge" of the frame that rests on your nose.The bridge size of most eyeglass frames will be 14 to 24 mm.
The third number, the temple length, is the length of the "arms" or "stems" of the frame, this includes the bend that sits behind your ear. Eyeglass temple size is measured from the hinge of the frame to the end tip of the temple. Temple lengths generally range from 120 to 150 mm.
Lastly, if you are going to be needing a bifocal or progressive lens, you would need to measure the lens height or B size. This is the vertical height of the lenses at the widest point of the lens within the frame. If the lens height is less than 30mm, it is not an ideal frame to use for progressive lenses.
In addition to the eye size, bridge size and temple length, you may see other numbers (or letters and names) stamped on the inside of the frame. These usually are the frame model and/or the color of the frame.
Be aware that two frames that have identical frame sizes may fit differently, depending on the style of the frame.