Understanding Glasses Measurements
Overview
- Glasses measurements are the numbers printed inside your frames that tell you lens width, bridge width and temple length.
- Matching these measurements helps you choose frames that fit comfortably when buying online.
Glasses measurements explained
Most glasses have a set of numbers printed on the inside of the temple arm. These measurements appear in millimetres and often follow a format like 52 18 140, representing lens width, bridge width and temple length.
Understanding these numbers helps you choose frames that match your features and fit comfortably.
Where to find your frame numbers
You can usually find sizing numbers printed on:
- the inside of the temple arm
- the inside of the bridge
- the nose pads on many acetate frames
How to measure your glasses
If your frame numbers have faded or you want to verify your size, you can measure your glasses at home using a ruler or measuring tape. This measurement should be taken in millimetres.
Lens width, bridge size, and temple length
Each of the main measurements affects how your glasses fit:
- Lens width: Influences how much of your eye area the frame covers. A lens width that is too large can feel loose, while one that is too small can feel tight or restrict your field of view.
- Bridge size: Affects how the glasses sit on your nose. A bridge that is too narrow can pinch, while one that is too wide can cause the frames to slide.
- Temple length: Impacts how securely your glasses stay in place. Temples that are too short may press behind the ears and/or not fit around the ear. Temples that are too long may slip during daily wear.
Measurement overview
EXPERT'S TIP!
“Start with a pair you already find comfortable. Match those measurements first, then explore different styles. This removes the guesswork and keeps your sizing consistent.”
Maria Horan, Dispensing Optician
Measuring your pupillary distance (PD)
Your PD helps your lenses align correctly with your eyes. For step-by-step instructions and tools to measure your PD, visit our dedicated guide.
Choosing frames that fit
Use your measurements as a base, then check the overall fit and proportions.
Why measurements matter
Correct measurements help your glasses sit comfortably, stay secure throughout the day and give you clear, accurate vision.
If you’re unsure about your measurements or need guidance choosing the right frame size, our certified optical experts are always here to provide personalised support.
