prEN ISO 18369-1
(Main)Ophthalmic optics - Contact lenses - Part 1: Vocabulary, classification system and recommendations for labelling specifications (ISO/DIS 18369-1:2025)
Ophthalmic optics - Contact lenses - Part 1: Vocabulary, classification system and recommendations for labelling specifications (ISO/DIS 18369-1:2025)
ISO 18369-1:2017 identifies and defines the terms applicable to the physical, chemical and optical properties of contact lenses, their manufacture and uses. It provides a vocabulary of terms and, when appropriate, the international symbol and abbreviation associated with a specific term. This document also defines the terms relating to contact lens care products. It also incorporates the classifications of contact lens materials and gives recommendations for the labelling of the specifications of contact lenses.
Augenoptik - Kontaktlinsen - Teil 1: Begriffe, Einteilung von Kontaktlinsenmaterialien und Empfehlungen für die Schreibweise von Kontaktlinsenspezifikationen (ISO/DIS 18369‑1:2025)
Optique ophtalmique - Lentilles de contact - Partie 1: Vocabulaire, système de classification et recommandations pour l'étiquetage des spécifications (ISO/DIS 18369-1:2025)
ISO 18369-1:2017 identifie et définit les termes applicables aux propriétés physiques, chimiques et optiques des lentilles de contact, à leur fabrication et à leur utilisation Il fournit une liste de termes et, si nécessaire, l'abréviation et le symbole internationaux associés à un terme spécifique. Le présent document définit également les termes relatifs aux produits d'entretien des lentilles de contact. Il comporte en outre la classification des matériaux de lentilles de contact et donne les recommandations pour l'étiquetage des spécifications des lentilles de contact.
Očesna optika - Kontaktne leče - 1. del: Slovar, sistem razvrstitve in priporočila za označevanje specifikacij (ISO/DIS 18369-1:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Očesna optika - Kontaktne leče - 1. del: Slovar, sistem razvrstitve in priporočila za
označevanje specifikacij (ISO/DIS 18369-1:2025)
Ophthalmic optics - Contact lenses - Part 1: Vocabulary, classification system and
recommendations for labelling specifications (ISO/DIS 18369-1:2025)
Augenoptik - Kontaktlinsen - Teil 1: Begriffe, Einteilung von Kontaktlinsenmaterialien und
Empfehlungen für die Schreibweise von Kontaktlinsenspezifikationen (ISO/DIS 18369-
1:2025)
Optique ophtalmique - Lentilles de contact - Partie 1: Vocabulaire, système de
classification et recommandations pour l'étiquetage des spécifications (ISO/DIS 18369-
1:2025)
Ta slovenski standard je istoveten z: prEN ISO 18369-1
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.
DRAFT
International
Standard
ISO/DIS 18369-1
ISO/TC 172/SC 7
Ophthalmic optics — Contact
Secretariat: DIN
lenses —
Voting begins on:
Part 1: 2025-05-15
Vocabulary, classification system
Voting terminates on:
2025-08-07
and recommendations for labelling
specifications
Optique ophtalmique — Lentilles de contact —
Partie 1: Vocabulaire, système de classification et
recommandations pour l'étiquetage des spécifications
ICS: 01.040.11; 11.040.70
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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BEING ACCEPTABLE FOR INDUSTRIAL,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 18369-1:2025(en)
DRAFT
ISO/DIS 18369-1:2025(en)
International
Standard
ISO/DIS 18369-1
ISO/TC 172/SC 7
Ophthalmic optics — Contact
Secretariat: DIN
lenses —
Voting begins on:
Part 1:
Vocabulary, classification system
Voting terminates on:
and recommendations for labelling
specifications
Optique ophtalmique — Lentilles de contact —
Partie 1: Vocabulaire, système de classification et
recommandations pour l'étiquetage des spécifications
ICS: 01.040.11; 11.040.70
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
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RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 18369-1:2025(en)
ii
ISO/DIS 18369-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions .1
3.1.1 Basic terms .1
3.1.2 Terms related to contact lens parameters and design .4
3.1.3 Terms related to aspheric contact lenses . 20
3.1.4 Terms related to bifocal and multifocal contact lenses .21
3.1.5 Terms related to scleral contact lenses and shells . 25
3.1.6 Terms related to contact lens material properties .27
3.1.7 Terms related to tinted contact lenses . 30
3.1.8 Terms related to contact lens manufacture .31
3.1.9 Terms related to packaging and labelling of contact lenses and contact lens care
products .31
3.1.10 Terms related to contact lens usage and wear modality .32
3.1.11 Terms related to contact lens hygienic management and contact lens care
products . 34
3.1.12 Miscellaneous terms .37
3.2 Symbols . 39
4 Classification of contact lens material.40
Annex A (informative) Specification of rigid contact lenses .43
Annex B (informative) Specification of soft contact lenses .58
Bibliography .60
Alphabetical index of terms .62
iii
ISO/DIS 18369-1:2025(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 SC 7,
Ophthalmic optics and instruments.
This third edition cancels and replaces the second edition (ISO 18369-1:2017), which has been technically
revised.
The main changes are as follows:
— Editorial update of the whole document;
— Add six new definitions related to scleral contact lenses and extend Annex A (informative) to include
representative examples of the specifications for lathe-cut scleral contact lenses of varying complexity
using the standard notation of this document.
A list of all parts in the ISO 18369 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/DIS 18369-1:2025(en)
Introduction
The ISO 18369 series applies to contact lenses, which are devices worn over the front surface of the eye in
contact with the preocular tear film. This document covers rigid (hard) corneal and scleral contact lenses, as
well as soft contact lenses. Rigid lenses maintain their own shape. Soft contact lenses are easily deformable
and require support for proper shape.
Clause 3 contains the terms and definitions primarily used in the contact lens field. A list of terms having
special symbols is given in Table 1.
The list of terms and definitions does not include all ISO terms, definitions, and symbols used in the contact
lens field. It is intended to be a convenient reference source from which the contents have been compiled
from the text of this and other ISO standards applicable to the manufacture, evaluation, measurement,
labelling and marketing of contact lenses and contact lens care products. An alphabetical index was added
for rapid finding of terms.
Words are grouped under several topics by reference number according to the general category into
which each word logically fits. The preferred form of each term is listed on the first line after its reference
number. Other admitted forms have been placed on subsequent lines after the preferred form. All admitted
terms are given in bold-faced type. A few obsolete and superseded terms are listed for historical reference
and convenience and to aid comprehension but are indicated as deprecated and are no longer to be used.
Obsolete and superseded terms are not in bold-faced type so that they may be clearly identified as terms
used historically.
Contact lenses are primarily used for the correction of refractive errors but they can also be used for
therapeutic purposes and cosmetic reasons. The materials used are divided into two main categories, rigid
and soft. The former is composed mainly of corneal lenses and to a lesser extent, scleral lenses. Both types
can be made from gas-permeable materials or non-gas permeable materials. Soft lenses are manufactured
primarily from hydrogel materials. A small number of lenses incorporate both a rigid material and a soft
material.
In terms of vision correction, contact lenses can be made as single-vision, bifocal, multifocal or progressi
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