Measuring the face structure is an ideal step in finding the right pair of glasses. That is how you can do it:
1: Stand in front of a mirror. Next, take a ruler to determine the distance between the center of your temples in cm.
2: After that, multiply that figure by 10 to find the measurement in mm.
3: Then, calculate the bridge of your nose between the inner corners of your eyes to define the width. Calculate from your temple to the back of your ear to find a rough arm length.
4: Anything between 3 mm from these measures should provide an acceptable fit for you.