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.
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.
PROGEAR EYEGUARD Size
Measurement From Your Dress Glasses
and determine size for:
If you are unsure about if 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 as illustrated below: