ISO/TR TECHNICAL REPORT 21958 First edition 2019-09 Ophthalmic optics Review of the test methods used to assess scratch and abrasion resistance of spectacle lenses Optique ophtalmique - Revue des méthodes de test utilisées pour évaluer la reésistance a la rayure et a I'abrasion des verres ophtalmiques Reference number IS0/TR 21958:2019(E) @ IS0 2019 IS0/TR 21958:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +4122 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland i @ IS0 2019 - All rights reserved