The frame size refers to the horizontal width of the frame, measured between the center of the left and the right hinge. Our frames come in one or multiple sizes. See the range in the chart below.
To find the correct frame size, use a ruler to measure the hinge-to-hinge distance of a pair of glasses. Consider the tolerance range of +/- 4mm.
The first one is the Model name, then the Lens width and Bridge width. There is usally a third number which represents the Temple Length, which is the measurement in millimeters of the ‘arms’ of the frame. Sometimes there is also a fourth number which is the Lens Height.
Each of these numbers is measured in mm.