Measurement System (ISO8624)

   ISO 8624 specifies a measuring system for spectacle frames and related terminology. It is applicable to fronts which are intended to be symmetrical.

                 - A, B, DBL, E, TL,□ 

               A – Horizontal boxed lens size.

               B – Vertical boxed lens size.

               DBL – Distance between lenses.

               E – Distance between noses.

               TL – Temple length.

   □  – Box symbol.

For example:

Printing size: A □DBL-TL