The size measurements of glasses are primarily expressed with a series of numbers written inside the temple of the glasses:

• 1. Size - 49□ 20 145 Misura del diametro orizzontale della lente nel punto di massima ampiezza (corrisponde alla taglia degli occhiali).
• 2. Bridge - 49□ 20 145 The part of the frame that rests on the nose and connects the lenses (corresponds to the distance between the lenses).
• 3. Height Measurement of the vertical diameter of the lens at the widest point inside the frame. The lens height is particularly important when measuring bifocal or progressive lenses.
• 4. Temple - 49□ 20 145 The length of the temple is measured in full, from the end to the connection with the front of the glasses.