ISO INTERNATIONAL STANDARD 8980-2 Third edition 2017-07 Ophthalmic optics Uncut finished spectacle lenses - Part 2: Specifications for power-variation lenses Optique ophtalmique - Verres de lunettes finis non détourés - Partie 2: Spécifications pour les verres a variation de puissance Reference number IS0 8980-2:2017(E) [so International Organization for Standardization @ IS0 2017 ZHEJIANG INSTOFSTANDARDIZATION C15956617 Not for Resale, 2017/9/27 05:17:32 ed without license from IHS IS0 8980-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Intenationaibr PrganizationforStandardization icensee-ZHEJIANG INST.OF STANDARDIZRoISQ s1.7 - All rights reserved Not for Resale, 2017/9/27 05:17:32 etworking permitted without license from IHS IS0 8980-2:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Classification 5 Requirements .2 5.1 Reference temperature .2 5.2 Optical requirements .2 5.2.1 General. 2 5.2.2 Back vertex power of power-variation lenses at the primary reference point. 2 5.2.3 Direction of the cylinder axis 2 5.2.4 Variation power (including addition power) .3 5.2.5 Prismatic power 3 5.2.6 Prism base setting .3 5.3 Requirements for size and thickness 4 5.4 Orientation requirement for polarizing lenses .4 6 Verification methods .4 6.1 General 4 6.2 Verification method for back vertex power. .4 6.3 Verification method for the direction of the cylinder axis .5 6.4 Verification method for prismatic power. .5 6.5 Verification method for variation power (including addition power) 6.5.1 General. .5 6.5.2 Procedure ..5 6.6 Inspection method for material and surface quality .5 7 Marking. .5 7.1 Permanent marking ..5 7.2 Optional non-permanent marking 8 Identification and information ..6 9 Reference to this document .6 1 Annex A (informative) Material and surface quality Bibliography .8 iii e=ZHEJIANG INSTOF STANDARDIZATION C15956617 vided by IHS underI ithoutlicense from IHS Not for Resale, 2017/9/27 05:17:32