ISO INTERNATIONAL STANDARD 13666 Third edition 2019-02 Ophthalmic optics Spectacle lenses - Vocabulary Optique ophtalmique - Verres de lunettes - Vocabulaire Reference number ISO 13666:2019(E) ISO @IS02019 IS0 13666:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 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: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 13666:2019(E) Contents Page Foreword ..iv Introduction. ..vii 1 Scope. 2 Normative references ..1 3 Terms and definitions ..1 3.1 Basic optics. .1 3.2 Lenses and their dispensing. 3.3 Lens materials 14 3.4 Lenssurfaces 15 3.5 Classification according to function 17 3.6 Classification according to form 18 3.7 Classification according to type of lens 19 3.8 Classification according to state of manufacture 20 3.9 Measurement of dioptric properties of lenses 22 3.10 Focal properties 24 3.11 Prismatic properties 28 3.12 Spherical-power lenses 30 3.13 Astigmatic-power lenses 30 3.14 Lenticularlenses 32 3.15 General descriptive terms for multifocal and power-variation lenses 33 3.16 Optical centration and focal properties of multifocal and power-variation lenses 37 3.17 Transmittance, reflectance and polarization 39 3.18 Coatings .46 Annex A (informative) Spectral weighting functions and spectral distributions ..48 Bibliography .59 Alphabetical index .60 @ IS0 2019 - All rights reserved iii