Frame size guide
Find the numbers on your current frame
Look on the inside of a temple arm or on the bridge. Most frames have three numbers printed there, such as 52□18-140 or 52-18-140. All three are in millimetres.
A Lens width — across one lens at its widest point.
B Bridge — the gap between the lenses that sits on your nose.
C Temple — the arm, from hinge to tip.
D Lens height — top to bottom of one lens.
E Frame width — the whole front, hinge to hinge. Compare it with a pair that already fits you; within 3 mm is usually comfortable.
| Number | What it is | Typical range |
|---|---|---|
| 52 | Lens width, across one lens | 40–62 mm |
| 18 | Bridge, the gap between the lenses | 14–24 mm |
| 140 | Temple length, hinge to tip | 120–150 mm |
How close is close enough?
- Frame width (the whole front) matters most. Within 3 mm of a frame that fits you is usually comfortable.
- Bridge: within 2 mm. A bridge that is too wide lets the frame slide down your nose.
- Temple length: within 5 mm. Metal frames with adjustable tips are more forgiving.
- Lens height matters for progressive lenses: most need at least 30 mm.
No frame to compare with?
Hold a ruler across your face in front of a mirror, from temple to temple at eye level. That is roughly the frame width that will suit you. As a rough guide:
| Your measurement | Look for |
|---|---|
| Under 130 mm | Narrow frames, lens width 46–49 |
| 130–140 mm | Medium frames, lens width 50–53 |
| Over 140 mm | Wide frames, lens width 54 and up |
Every frame on the site lists these measurements on its product page, and you can filter by size on the eyeglasses page.