The single most common reason a pair of glasses gets returned is width. Not colour, not style — width. Since we have no showroom and no trial counter, this is the method we would talk you through at a counter if we had one.
Start with a frame you already like
Find a pair you own that sits comfortably. Not the pair you love the look of — the pair you actually reach for, because comfort is what you are trying to reproduce. Lay it flat, front facing up.
The measurement that matters
Measure the horizontal width of one lens at its widest point, in millimetres. That is the lens width, and it is the number stated on our product pages where the supplier provides it. Frames in the 50–54 mm range suit narrower faces, 55–58 mm covers most adults, and above 58 mm reads as oversized.
If the arms of your current pair press at the temples, look for a wider total front. If the frame slides down your nose, the bridge is too wide for you rather than the lens being too big — a common misdiagnosis that leads people to buy a smaller frame that still slides.
Reading the tiny numbers on the arm
Many frames have three numbers printed inside one temple arm, in the form 54▫18-140. Those are lens width, bridge width and temple length, all in millimetres. If your existing pair has them, you can skip the ruler entirely.
Where photographs mislead
Product photography is taken square-on against a plain background, which flattens depth and makes almost every frame look moderate. A photo of a model wearing a frame is worse, not better, for judging size — you are comparing against a face you have never measured. The number is the honest guide.
When the number is not enough
Sometimes it simply will not suit, and no amount of measuring predicts that. That is what the return window is for: order the pair, try it in daylight at home, and send it back if it is wrong. We would rather process a return than have you keep a frame you do not wear.