ISO INTERNATIONAL STANDARD 18369-2 Third edition 2017-08 Ophthalmic optics Contact lenses Part 2: Tolerances Optique ophtalmique - Lentilles de contact - Partie 2: Tolérances Reference number IS0 18369-2:2017(E) [so International Organization for Standardization @IS02017 vided by IHS under I mitted without license from IHS IS0 18369-2:2017(E) COPYRIGHT PROTECTED DOCUMENT 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 written permission. Permission can be requested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internatinir DrganizationforStandardization @ IS0 2017 - All rights reserved No reproduction or networking permited without license from IHS IS0 18369-2:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 General 4.1 Tolerance limits for contact lenses .1 4.2 Conformance criteria for testing products 4.3 Conditioningofcontactlensespriortotesting 2 4.4 Transmittanceofultravioletradiation .2 4.5 Reguirementsforfinish 2 4.5.1 Inclusions and surface imperfections .2 4.5.2 Fenestrations.. 2 4.5.3 Edge contour and finish 2 4.6 Additional properties. .2 5 Tolerances for rigid contact lenses .2 6 Tolerances for soft contact lenses ..4 Bibliography 7 Intemaional oganzation @stS2017 - All rights reserved iii vided by IHS under I d without license from IHS