How to find your frame 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.
Once you measure this ear-bow to ear-bow distance, you can refer to the following chart to determine the Eyeguard size that fits you.
In case you still have doubt, take a picture of your dress frame like above with a ruler across the widest point. Email us together with your prescription and order number. We can help you to determine. Ensure the picture is taken at an upright position like below: