CEN/TC 170/WG 3 - Spectacle frames
Spectacle frames
General Information
Specifies the characteristics of formers which are used in edging machines to edge lenses designed for insertion into spectacle frames. Not applicable to separate formers required for supplementary treatment of lenses, for example facetting.
- Standard5 pagesEnglish languagee-Library read for1 day
Specifies requirements for ISO metric screw threads for use with spectacle frames. Provision is made for screw threads of the following nominal sizes: S0,8 × 0,2, M1,0 × 0,25, M1,2 × 0,25, M1,4 × 0,3, M1,6 × 0,35 and M2,0 × 0,4, and for related taps and gauges (in accordance with ISO 529 and ISO 1502).
- Standard6 pagesEnglish languagee-Library read for1 day
Specification of criteria for the marking of spectacle frames.
- Standard6 pagesEnglish languagee-Library read for1 day
Specification of a uniform measuring system in order to avoid that spectacles are manufactured incorrectly.
- Standard5 pagesEnglish languagee-Library read for1 day
Frequently Asked Questions
CEN/TC 170/WG 3 is a Working Group within the European Committee for Standardization (CEN). It is named "Spectacle frames". This committee has published 4 standards.
CEN/TC 170/WG 3 develops CEN standards. Currently, there are 4 published standards from this working group.
The European Committee for Standardization (CEN) is a public standards organization that brings together the national standardization bodies of 34 European countries. CEN provides a platform for developing European Standards (ENs) and other technical documents in relation to various products, materials, services, and processes, supporting the European Single Market.
A Working Group in CEN is a specialized group responsible for developing standards or technical work within a defined scope. These bodies bring together international experts to create consensus-based standards that support global trade, safety, and interoperability.