Fit guide
Three numbers on every frame, a few measurements on your face, and a quick video call with our fit team — that's all it takes. If you're unsure, write to contact@irdae.com with a face-on photo and we'll measure for you, free.
Reading the frame size
Every Irdae frame has three numbers in the description and inside the temple: e.g. 50-22-145.
- 50 — lens width in mm
- 22 — bridge width in mm
- 145 — temple length (hinge to tip)
Pick up a pair you already wear and read the numbers from inside the temple — it's the fastest way to know what size suits you.
Lens width & face width
The lens width is the most important number. Match it to your face width.
| Number | Where to find it | Range | Suits |
|---|---|---|---|
| Lens width | First number, e.g. 50 in 50-22-145 | 44-48 mm | Small frame · narrow face · 130-138 mm face width |
| Lens width | First number | 49-52 mm | Medium frame · average face · 139-145 mm face width |
| Lens width | First number | 53-56 mm | Large frame · wider face · 146+ mm face width |
How to measure
Four measurements you can take in a minute:
| Measure | How | Reference | Note |
|---|---|---|---|
| Face width | Temple-to-temple, ear-base to ear-base | From a face-on photo, in front of a mirror | Use a soft tape measure or ruler |
| Bridge fit | Distance between the lenses, sitting on the nose | Acetate bridges are fixed; titanium bridges have adjustable pads | If you see a gap above the nose, the bridge is too wide |
| Temple length | Distance from hinge to the bend behind the ear | 135-150 mm covers most adults | Should rest just past the back of the ear, not press |
| Pupillary distance (PD) | Distance between the centres of your pupils | 58-68 mm average | Printed on most prescriptions; if not we'll measure from a photo |
Material & adjustment
How much we can adjust a frame depends on the material.
| Material | Properties | Flex | Adjustment |
|---|---|---|---|
| Acetate (M49) | Vegetable-based acetate, hand-polished | Slight warmth-flex possible | Hand-fit at our Annecy studio in 15 minutes; via video on request |
| Beta titanium | Lightweight (10-13 g), nickel-free | Adjustable pads, bend-able temples | Holds adjustment for years; brittle if forced cold — return for adjustment |
| TR-90 | Reserved for sport wraparound | Memory-flex | Returns to shape after stress |
Frame shape by face shape
Not a rule, just a starting point. The right frame is the one that feels forgotten on your face.
Oval face
Most frames suit oval faces — try round and aviator for personality, square for structure.
Round face
Squared and rectangle frames bring definition. Avoid round frames unless oversized.
Square face
Round and oval frames soften strong jawlines. Cat-eye works on heart variants of square.
Heart face
Bottom-heavy frames balance a wider forehead — aviator, cat-eye, round-bottom.
Long / oblong face
Wide frames with deeper lenses break vertical length. Round and oversized squared.
Still unsure?
We're happy to help. Three options:
- Photo measure: send a face-on photo to contact@irdae.com and we'll send back recommended sizes within 24h.
- Video fitting: 15 minutes with our fit team — adjust pads, temple curves, lens height. Free.
- Studio visit: Annecy, Saturdays 10—16h, by appointment.