This International Standard specifies a measuring system for spectacle frames and related terminology. It is applicable to fronts which are intended to be symmetrical
EN ISO 8624:2011 history
2020EN ISO 8624:2020 Ophthalmic optics - Spectacle frames - Measuring system and vocabulary (ISO 8624:2020)
2015EN ISO 8624:2011/A1:2015 Ophthalmic optics - Spectacle frames - Measuring system and terminology (ISO 8624:2011/Amd 1:2015)
2011EN ISO 8624:2011 Ophthalmic optics - Spectacle frames - Measuring system and terminology (ISO 8624:2011)
2002EN ISO 8624:2002 Ophthalmic Optics - Spectacle Frames - Measuring System and Terminology ISO 8624: 2002
1996EN ISO 8624:1996 Optics and Optical Instruments - Opthalmic Optics - Measuring System for Spectacle Frames