Do you know that frames also have sizes?
yes they do , you can always take your prevous frames and search for the size , but what about if you dont have it ?
well we have an easy solution for you to know wich one do you need to purchase
Take whatever card you have on hand, since almost all of them have the same measurements (5.60 mm × 53.98 mm). In front of a mirror try to position your phone so you can take a selfie. If there is someone to take your photo, it is also an option.
Put the card on the bridge of the nose and under the eyebrows.
If the edge of the card sticks out from the edge of your eye, then you are a size S. (Size Small), less than 50mm.
If the edge of the card ends at the outer edge of your eye, then you are a size M. (Size Medium), between 51mm and 54mm.
If the edge of the card ends before the outside of your eye, then you are a size L. (Size Large), over 54mm.