EN ISO 13666:2019

SLOVENSKI STANDARD
01-maj-2019
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SIST EN ISO 13666:2013
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Ophthalmic optics - Spectacle lenses - Vocabulary (ISO 13666:2019)
Augenoptik - Brillengläser - Vokabular (ISO 13666:2019)
Optique ophtalmique - Verres de lunettes - Vocabulaire (ISO 13666:2019)
Ta slovenski standard je istoveten z: EN ISO 13666:2019
ICS:
01.040.11 Zdravstveno varstvo Health care technology
(Slovarji) (Vocabularies)
11.040.70 Oftalmološka oprema Ophthalmic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13666
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 01.040.11; 11.040.70 Supersedes EN ISO 13666:2012
English Version
Ophthalmic optics - Spectacle lenses - Vocabulary (ISO
13666:2019)
Optique ophtalmique - Verres de lunettes - Vocabulaire Augenoptik - Brillengläser - Vokabular (ISO
(ISO 13666:2019) 13666:2019)
This European Standard was approved by CEN on 24 October 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13666:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 13666:2019) has been prepared by Technical Committee ISO/TC 172 "Optics
and photonics" in collaboration with Technical Committee CEN/TC 170 “Ophthalmic optics” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2019, and conflicting national standards
shall be withdrawn at the latest by September 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 13666:2012.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 13666:2019 has been approved by CEN as EN ISO 13666:2019 without any modification.

INTERNATIONAL ISO
STANDARD 13666
Third edition
2019-02
Ophthalmic optics — Spectacle lenses
— Vocabulary
Optique ophtalmique — Verres de lunettes — Vocabulaire
Reference number
ISO 13666:2019(E)
©
ISO 2019
ISO 13666:2019(E)
© 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
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 13666:2019(E)
Contents Page
Foreword .iv
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Basic optics . 1
3.2 Lenses and their dispensing . 4
3.3 Lens materials .14
3.4 Lens surfaces .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 Lenticular lenses .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
ISO 13666:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 172 Optics and photonics, Subcommittee 7,
Ophthalmic optics and instruments.
This third edition cancels and replaces the second edition (ISO 13666:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Since the document is for spectacle lens terminology, the single word “lens” rather than “spectacle
lens” is used throughout the document.
— This revision has resulted in a few terms that were no longer used in lens standards or in
communications between participants in the lens manufacturing and dispensing chain being
deleted. The terms that were in clause 17 have been either moved or incorporated into earlier terms.
— Over 50 % of terms and definitions have been revised. In some cases, this is as little as changing
the order of synonyms for the term, to significant changes in the wording of definitions or notes to
entry, but without change of meaning.
— The meaning of vertex distance has been altered so that it now refers to the horizontal distance
between the back surface of the lens and the apex of the cornea, measured with the eyes in the
primary position. The plane of the lens shape is now defined as being the plane containing the
vertical centreline parallel to the horizontal centreline of the individual lens based on the apex of
the groove instead of being based on the plane tangential to the demonstration lens. The design
reference points are where the manufacturer's specifications apply, while the reference points are
where the lenses are to be verified. For single-vision and most multifocal lenses, these are the same.
The previous distinction for a multifocal lens, where the distance design reference point was usually
the centre of the semi-finished lens blank (now called simply "blank") while the distance reference
point was usually the intended position of the optical centre of the distance portion after surfacing,
has been removed — they are the design reference point or simply the reference points of the blank
and the finished lens.
iv © ISO 2019 – All rights reserved

SIST EN ISO 136
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