Glasses Size Guide: What the Numbers on Your Frame Mean

Reading the three numbers

Using 52□18-140 as an example:

• 52: lens width. How wide each lens is, in mm.
• 18: bridge width. The gap between the lenses that sits on your nose.
• 140: arm (temple) length, from the hinge to the tip behind your ear.

Using them to choose a new frame

If your current glasses fit well, look for a frame within about 2 mm of your lens width and bridge width. Arm length matters less, because arms can be adjusted.

A wider frame sits further out on your face; a narrower one sits closer in. The frame should be about as wide as your face, with your eyes near the centre of each lens.

No numbers on your frame?

Measure across one lens at its widest point with a ruler, in millimetres. A bank card is about 85 mm wide if you want a quick reference. Send us a photo on WhatsApp and we can help you compare.

Common questions

What size glasses do I need?

Use the numbers inside the arm of a pair that fits you well, and choose a frame within about 2 mm of the lens and bridge width.

Can you tell me the size of a frame in your shop?

Yes. Message us on WhatsApp with the frame name and we will send its measurements.