Size Guide

Finding the right frame size is an important part of buying eyewear online, as that’s what we base all our sizes at Zanylen Optical. Luckily, it's also super simple! Below is a helpful guide to understanding glasses measurements and sizes.

You can usually find the measurements on the inside of the temple of your glasses. The frame measurements normally appear as three numbers separated by dashes — for example, 48-19-140. These three numbers correspond to the lens width, bridge width and temple length.

Lens Width

This is the horizontal width of each lens, measured at its widest point. It typically ranges from 40 mm to 60 mm.

Bridge Width

This is the distance between your two lenses. The bridge size ranges from 14 mm to 24 mm.

Lens Height

This is the vertical height of your lenses. Lens height is especially important when measuring bifocal or progressive lenses.


Temple Length

This is the length of the temple from the hinge to the temple tip, including the bended part that sits on your ear. The arm length is typically 120 mm to 150 mm long.

Other useful measurements

Temple length

The temple should fit evenly and horizontally along the side of your head and rest comfortably on your ear.

Bridge width

The bridge should sit nicely above your nose. For close-set eyes, the ideal length is shorter, while for wide-set eyes, it will be longer.

If you’ve already got a pair of glasses that fit, you can measure from screw to screw. This complete measurement would be your ideal frame width.
 But remember, all glasses are different, so it’s just a general ballpark to have in mind.

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