Made to your measurements
Lens width, bridge and temple length are set for your face rather than picked from a rack of standard sizes.
Frame size guide
Find your frame size in two minutes
No tape measure needed. Use a bank card and a mirror, or read the three numbers already printed inside a pair of glasses you own.
The bank card test
Bank and debit cards are made to one international size, which makes them a ruler you already carry.
- Stand in front of a mirror with a bank or debit card, or another card exactly the same size.
- Hold the card upright against your face, one long edge on the centre of your nose.
- Look at where the far edge of the card lands against the outer corner of your eye.
Where did the edge of the card land?
- Small: Past the outer corner of my eye. The card reaches beyond the corner of your eye, so a narrower frame will sit in proportion.
- Medium: Right at the outer corner. The card ends at the corner of your eye: the size most adult faces start from.
- Large: Short of the outer corner. The card stops before the corner of your eye, so a wider frame will keep your eyes centred in the lenses.
Read the temple arm
Most frames print three numbers inside one arm, such as 52□18-140: lens width, bridge width and temple length, in millimetres. The first number sets the size.
| Size | Eyeglasses | Sunglasses |
|---|---|---|
| Small | Under 48 mm | Under 56 mm |
| Medium | 48–55 mm | 56–64 mm |
| Large | Over 55 mm | Over 64 mm |
Brands size differently, and rim thickness changes the overall width. Treat the chart as a starting point, not a verdict.
Pick Medium. The studio checks it with you.
Medium is the safest place to start for most adults. Bespoke frames are made to your measurements, and the studio reviews your face photo before work begins, so the size you choose here is a starting point, not a final answer.
Measure your PD too
Your pupillary distance is what centres each lens. Measure it free with your phone camera and the same card.
Ask before you commit
Send the studio your numbers or a photo of your current frame and get a size recommendation in reply.
Start a bespoke eyewear brief · Measure your PD · Ask the studio
Frequently asked questions
What do the numbers on my glasses mean?
They are the frame size in millimetres, in the order lens width, bridge width, temple length. On a frame marked 52□18-140 each lens is 52 mm wide, the bridge between the lenses is 18 mm, and each arm is 140 mm long. The box symbol means the lens was measured with the standard boxing system.
Which cards work for the card test?
Any bank or debit card. They are all made to one international size, 85.60 × 53.98 mm (ISO/IEC 7810 ID-1), and so are most national ID cards and driving licences. Loyalty and gift cards are often a different size, so lay one over a bank card before you rely on it. Hold the card upright so its 54 mm width runs from the centre of your nose towards your eye.
Which number matters most for fit?
Lens width sets the size band, but the total width of the frame front decides whether it fits. Two frames with the same lens width can fit differently when their bridges or rims differ. Horn rims are usually thicker than metal ones, so compare lens, bridge and lens added together when you change material.
Is frame size the same as PD?
No. Pupillary distance (PD) is the distance between your pupils, which the lab uses to centre each lens. Frame size is the width of the frame itself. Prescription eyewear needs both, and you can measure your PD free with the optical toolkit.
What if I am between two sizes?
Choose Medium. For a bespoke frame, the studio reviews your measurements and face photo before work begins and will suggest a different size if Medium looks wrong for you.