What do the numbers printed on the frame mean?

The numbers printed on the inside of the temple of eyeglass frames provide important information about the size and dimensions of the frame. Here’s what each number typically represents:

1. Lens Width

• Number: Usually the first number in the sequence, it indicates the horizontal width of one lens, measured in millimeters.
• Example: A number like “50” means each lens is 50mm wide.

2. Bridge Width

• Number: The second number in the sequence, it represents the distance between the lenses, or the width of the bridge that rests on your nose, also measured in millimeters.
• Example: A number like “18” means the bridge width is 18mm.

3. Temple Length

• Number: The third number in the sequence, it measures the length of the temples (the arms of the glasses) from the hinge to the end that rests behind your ears, measured in millimeters.
• Example: A number like “140” means the temple length is 140mm.

4. Additional Information

• Material Codes: Some frames might also include codes or abbreviations indicating the material of the frame or special features.
• Example: “Titanium” or “Acetate” might be printed to indicate the material.

How to Read the Numbers

The numbers are typically printed in the following format: Lens Width / Bridge Width / Temple Length.

For example, a frame with the numbers “52-18-140” would have:

• Lens Width: 52mm
• Bridge Width: 18mm
• Temple Length: 140mm

Understanding these numbers helps ensure that you select a frame that fits well and is comfortable for your face shape and size. If you’re unsure about how to interpret these measurements, an optician can assist you in finding the right frame size based on your personal needs.