What do my glasses measurements mean?
The numbers showcasing the measurements of your glasses relate to the following: the diameter of the lenses, the width of the bridge (across your nose) and the length of the sides (arms and temples).
Glasses measurements are typically written in millimetres.
Here is a short guide on how to understand these numbers.
The Lens Diameter
The diameter of the lens is the first number. It’s measured from the bridge and is the lens width (in mm). The size of your lenses is largely determined by the design of your frame and your prescription.
The Bridge Width
The bridge width is the second number and measures the gap between your lenses and your nose. If the glasses are too tight, they will pinch your nose and not sit comfortably on your face. If your glasses are the correct bridge size, they will sit comfortably on the face.
The length is the third and biggest number. The standard and most common length sizes are 135,140 and 145mm. You'll know which length is right for you if the arms are long enough to sit comfortably over your ears.