How to Read Your Frame Measurements

If you already wear glasses, you can find your frame size printed on the inside of the temple arm. You will usually see three numbers in this order:

Lens Width • Bridge Width • Temple Length
Sometimes a fourth number, Lens Height, may also appear. All measurements are in millimeters (mm).

1. Lens Width

The horizontal width of each lens at its widest part.
Typical range: 40mm – 60mm

2. Bridge Width

The distance between the lenses — the area that sits on your nose.
Typical range: 14mm – 24mm

3. Temple (Arm) Length

The length from the hinge screw to the tip behind your ear.
Typical range: 120mm – 150mm
Common sizes: 135mm, 140mm, 145mm, 150mm

4. Lens Height

The vertical height of the lens at its tallest point.
Important for bifocal and progressive lenses.

Tips for Choosing the Right Frame Size

Frame Width

Your frame should be slightly wider than your face.
Leave about one finger width between your temple and the frame.
More space means the frame is too wide; less means it’s too narrow.

How to measure:
Measure across the front of the entire frame, including the hinges.

Temple Length

Temple length affects comfort and stability.
The temples should rest naturally over your ears.
Too short and the frames pull forward; too long and they slide down.

How to measure:
Measure from the hinge screw to the tip behind your ear.

Lens Width & Lens Height

Size guide:
Small: 50mm or less
Medium: 51mm – 54mm
Large: 55mm or more

Your eyes should appear centered in the lenses.
Too wide and your eyes look close together; too narrow and they look farther apart.

How to measure:
Measure the widest part of each lens.

Bridge Width

The right bridge ensures stability and comfort.
Lower numbers suit close-set eyes or smaller noses.
Higher numbers suit wide-set eyes or broader noses.

Nose position tips:
Higher nose bridge: choose frames with a level or straight top bridge.
Lower nose bridge: choose frames with a lower-set or curved bridge.

How to measure:
Measure the distance between the inner edges of the two lenses.

Find Your Perfect Frame Size

Now that you know how to read frame measurements, explore Mafami’s handcrafted eyeglasses and sunglasses for men and women.

If you'd like, I can also create:
• Lens Index & Material Guide
• How to Measure Your PD
• Progressive Lens Fitting Guide