How to find your Eyeguard size

Pick the most comfortable pair of glasses you own. Lay your glasses on a flat surface with the temple arms fully extended as if you are wearing them. Measure the widest distance between the temples. For most frames, this distance will likely be measured at the ear bow of the temples, i.e. the ear bow is the point that sits right above your ear when you are wearing the glasses.

correct way to measure_2

Once you've measured the ear-bow to ear-bow distance, you can refer to the following chart to determine the Eyeguard size that fits you.


Measurement From Your Dress Glasses and determine size for:

Temple version

Strap version


Less than 120mm

Less than 115mm


121 – 130mm

116 – 125mm


131 – 135mm

126 – 130mm


Bigger than 135mm

Bigger than 130mm


If you are unsure you have measured you frame correctly, then take a picture of your eyewear frame as shown above with a ruler across the widest point.  Email us the image together with your prescription and order number.  We will help you to determine the right frame for you.  Ensure the picture is taken at an upright position like this:

take photo as below

If you are still not sure, please use our "Home Try-On" service.