What do my glasses measurements mean?
The measurements of your glasses are the dimensions of the frame, typically written in millimetres.
- The first number shows the diameter of the lenses
- The second number indicates the width of the bridge (across your nose)
- The third number shows the length of the temple/arms
Here is a short guide on how to understand these numbers.
The Lens Diameter
The first number is the thickness or width of the lens measured in millimetres. The size of your lenses is mostly determined by the design of your frame as well as your prescription.
The Bridge Width
The second number is measured from the bridge above your nose between the lenses. If the glasses are too tight, they will squeeze your nose and feel uncomfortable. If your glasses are the correct bridge size, they will sit comfortably on the face.
The third number is the length; this is the biggest number. The standard and most common length sizes are 135, 140 and 145mm. You'll know if the temple size is right for you if the arms are long enough to sit comfortably over your ears.