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Understanding Frame Measurements
If you look on the inside of your glasses, you’ll find a number that looks like: 54 18 135. This information shows you the size of your glasses; the lens diameter, the bridge width and the side length, all measured in millimetres.
1. The lens diameter is the width of the lens (in mm), measured from the bridge. The size of your lenses can be a matter of personal choice, but it’s also determined by your frame style and prescription.
2. The bridge width is the gap above your nose between the lenses. It’s important that this is comfortable - too tight, and the glasses could pinch your nose; too loose and the glasses won’t be stable on your face.
3. The length of the side is usually one of three standards – 135, 140 or 145mm. The side should be long enough to sit comfortably over your ears. Glasses with straight sides all the way to the end don’t always have this measurement indicated.
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Hefin by Specstown
Metal Acetate frame
Metal indent temple design
Combined Acetate Nose Pads
Medium Fit -�53-17-145
Clear temple tips
This is a Specstown Design: we're here for the exclusives and latest trends in eyewear fashion. Unique to Specstown, our specialised designs are here for you with our universal fashion range. These are produced by us but modelled by you.
A square frame with a smooth acetate front and metal temple/ tip regions.
Our user-friendly system allows you to select the lens type that suits your needs, be it single vision, reading, or multifocal.
Simply input your prescription values, including sphere, cylinder, axis, and additional parameters. If you're unable to provide your prescription upfront, no worries - you can proceed with your order and send it later.