Every designer frame has its size printed inside the arm: three numbers, all in millimetres.
| Number | What it measures | Typical range |
|---|---|---|
| 50 | Lens width: one lens, at its widest | 45–62 mm |
| 21 | Bridge: the gap between the lenses | 14–24 mm |
| 145 | Temple: the arm, hinge to tip | 135–150 mm |
The other codes
Model (SPR C03S) and colour code (16K-08Z) identify the exact pair. Lens category (3N) shows how dark the lens is, from 0 to 4; on Ray-Ban, P means polarized.
Find your size
- Read the numbers on a pair that already fits you.
- Choose frames within 2–3 mm on lens width and bridge.
- As a guide: under 50 mm is small, 50–54 mm medium, 55 mm and up large.
Every Frames Central listing shows all three numbers. Not sure? Send us yours and we will help you choose.