SIST EN ISO 12870:2025

SLOVENSKI STANDARD
01-oktober-2025
Nadomešča:
SIST EN ISO 12870:2018
Očesna optika - Okviri očal - Zahteve in preskusne metode (ISO 12870:2024)
Ophthalmic optics - Spectacle frames - Requirements and test methods (ISO
12870:2024)
Augenoptik - Brillenfassungen - Anforderungen und Prüfverfahren (ISO 12870:2024)
Optique ophtalmique - Montures de lunettes - Exigences et méthodes d'essai (ISO
12870:2024)
Ta slovenski standard je istoveten z: EN ISO 12870:2025
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12870
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2025
EUROPÄISCHE NORM
ICS 11.040.70 Supersedes EN ISO 12870:2018
English Version
Ophthalmic optics - Spectacle frames - Requirements and
test methods (ISO 12870:2024)
Optique ophtalmique - Montures de lunettes - Augenoptik - Brillenfassungen - Anforderungen und
Exigences et méthodes d'essai (ISO 12870:2024) Prüfverfahren (ISO 12870:2024)
This European Standard was approved by CEN on 17 November 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12870:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European standard and the General
Safety and Performance Requirements of Regulation (EU) 2017/745 aimed to be
covered. 4
European foreword
This document (EN ISO 12870:2025) 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 February 2026, and conflicting national standards
shall be withdrawn at the latest by February 2026.
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 12870:2018.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 12870:2024 has been approved by CEN as EN ISO 12870:2025 without any modification.

Annex ZA
(informative)
Relationship between this European standard and
the General Safety and Performance Requirements of
Regulation (EU) 2017/745 aimed to be covered
This European standard has been prepared under M/575 to provide one voluntary means of
conforming to the General Safety and Performance Requirements of Regulation (EU) 2017/745 of 5
April 2017 concerning medical devices [OJ L 117] and to system or process requirements including
those relating to quality management systems, risk management, post-market surveillance systems,
clinical investigations, clinical evaluation or post-market clinical follow-up.
Once this standard is cited in the Official Journal of the European Union under that Regulation,
compliance with the normative clauses of this standard given in Table ZA.1 and application of the
edition of the normatively referenced standards as given in Table ZA.2 confers, within the limits of the
scope of this standard, a presumption of conformity with the corresponding General Safety and
Performance Requirements of that Regulation, and associated EFTA Regulations.
Where a definition in this standard differs from a definition of the same term set out in Regulation (EU)
2017/745, the differences shall be indicated in this Annex Z. For the purpose of using this standard in
support of the requirements set out in Regulation (EU) 2017/745, the definitions set out in this
Regulation prevail.
Where the European standard is an adoption of an International Standard, the scope of this standard
can differ from the scope of the European Regulation that it supports. As the scope of the applicable
regulatory requirements differ from nation to nation and region to region, the standard can only
support European regulatory requirements to the extent of the scope of the European regulation for
medical devices (EU) 2017/745).
NOTE 1 Where a reference from a clause of this standard to the risk management process is made, the risk
management process needs to be in compliance with Regulation (EU) 2017/745. This means that risks have to be
‘reduced as far as possible’, ‘reduced to the lowest possible level’, ‘reduced as far as possible and appropriate’,
‘removed or reduced as far as possible’, ‘eliminated or reduced as far as possible’, ’removed or minimized as far as
possible’, or ‘minimized’, according to the wording of the corresponding General Safety and Performance
Requirement.
NOTE 2 The manufacturer’s policy for determining acceptable risk must be in compliance with General Safety
and Performance Requirements 1, 2, 3, 4, 5, 8, 9, 10, 11, 14, 16, 17, 18, 19, 20, 21 and 22 of the Regulation.
NOTE 3 When a General Safety and Performance Requirement does not appear in Table ZA.1, it means that it is
not addressed by this European Standard.
Table ZA.1 — Correspondence between this European standard and Annex I of Regulation (EU)
2017/745 [OJ L 117]
General Safety and
Clause(s)/subclause(s)
Performance Requirements Remarks/notes
of this EN
of Regulation (EU) 2017/745
1 4 Clause 4 of the standard only
meets the requirements of
Annex I, GSPR 4 of the
Regulation in respect of
detailing the requirements for
spectacle frames.
3 a) 4.3 4.3 of the standard only
partially meets the
requirements of Annex I, GSPR
3 (a) of the Regulation in
respect of risk management
since it gives only general
guidance.
4 (a) 4.2 4.2 of the standard only
partially meets the
requirements of Annex I, GSPR
4 (a) of the Regulation in
respect of construction since it
gives only guidance.
5 (a) 4.2, 4.12 4.2 and 4.12 of the standard
only partially meet the
requirements of Annex I, GSPR
5 (a) of the Regulation in
respect of reducing risk (4.2)
and mechanical stability (4.12).
6 4.10, 4.11, 4.12 4.10, 4.11 and 4.12 of the
standard only partially meet
the requirements of Annex I,
GSPR 6 of the Regulation in
respect of possible changes in
shape caused by raised
temperature (4.10), surface
quality (4.11) and mechanical
strength (4.12).
7 4.10 4.10 of the standard only meets
the requirements of Annex I,
GSPR 7 of the Regulation in
respect of temperature when in
use but not in packaging or
transport. The test
temperature is, however,
greater than any likely to be
met during transport.
General Safety and
Clause(s)/subclause(s)
Performance Requirements Remarks/notes
of this EN
of Regulation (EU) 2017/745
10.1 (a) 4.4, 4.13 4.4 and 4.13 of the standard
only meet the requirements of
Annex I, GSPR 10.1 (a) of the
Regulation in respect of
flammability (4.13) and only
partially met with respect to
toxicity by the guidance on
materials in 4.4.
10.1 (b) 4.4, 4.5, 4.11 4.5 of the standard only meets
the requirements of Annex I,
GSPR 10.1 (b) of the Regulation
in respect of nickel allergy
(4.5);
4.4 and 4.11 of the standard
only partially meet the
requirements of Annex I, GSPR
10.1 (b) of the Regulation in
respect of manufacture since
while 4.4 gives guidance on the
materials that can be used, it
does not specifically address
the aspects of chemicals from
the frame being absorbed,
distributed, metabolised and
excreted. 4.11 covers damage
to the surface by perspiration,
which might be a two-way
process, allowing damaged
constituents of the frame to
enter the skin.
10.1 (d) 4.5 4.5 of the standard only meets
the requirements of Annex I,
GSPR 10.1 (d) of the Regulation
in respect of nickel release –
the welding of metals to
construct a spectacle frame can
result in changes to the original
material properties of the
metals.
10.1 (f) 4.12 4.12 of the standard only meets
the requirements of Annex I,
GSPR 10.1 (f) of the Regulation
in respect of all listed
mechanical properties except
ductility which is not relevant
to spectacle frames.
General Safety and
Clause(s)/subclause(s)
Performance Requirements Remarks/notes
of this EN
of Regulation (EU) 2017/745
10.1 (g) 4.2, 4.11 4.2 and 4.11 of the standard
only meet the requirements of
Annex I, GSPR 10.1 (g) of the
Regulation in respect of surface
quality when new by 4.2 and
after wear by 4.11
10.4.1 4.5 4.5 of the standard only
partially meets the
requirements of Annex I, GSPR
10.4.1 of the Regulation in
respect of nickel release
10.4.3 4.4 4.4 of the standard only
partially meets the
requirements of Annex I, GSPR
10.4.3 of the Regulation in
respect of phthalates which are
not specifically mentioned;
manufacturers are aware of
these substances.
14.1 4.12.2 4.12.2 of the standard only
meets the requirements of
Annex I, GSPR 14.1 of the
Regulation in respect of
retaining spectacle lenses.
14.2 (a) 4.8 4.8 of the standard only
partially meets the
requirements of Annex I, GSPR
14.2 (a) of the Regulation in
respect of dimensional
tolerances.
14.2 (b) 4.10 4.10 of the standard only
partially meets the
requirements of Annex I,
GSPR 14.2 (b) of the Regulation
in respect of temperature. All
the other external influences
are not applicable.
14.3 4.13 4.13 of the standard only
partially meets the
requirements of Annex I,
GSPR 14.3 of the Regulation in
respect of the risk of catching
fire.
14.5 4.12.2 4.12.2 of the standard only
meets the requirements of
General Safety and
Clause(s)/subclause(s)
Performance Requirements Remarks/notes
of this EN
of Regulation (EU) 2017/745
Annex I, GSPR 14.5 of the
Regulation in respect of
compatibility with spectacle
lenses required by the lens
retention test in 4.12.2.
20.1 4.12 4.12 of the standard only meets
the requirements of Annex I,
GSPR 20.1 of the Regulation in
respect of mechanical
performance.
22.1 4.2, 4.4 ,4.10, 4.11 4.12 4.2, 4.4, 410, 4.11 and 4.12 of
the standard together only
meet the requirements of
Annex I, GSPR 22.1 of the
Regulation in respect of
performance requirements
from the wearer's point of
view. Spectacle frames are
intentionally designed for use
by lay persons and as a Class I
product have no information
for users.
23.1 (a) 9 9 of the standard only meets
the requirements of Annex I,
GSPR 23.1 (a) of the Regulation
in respect of the labelling to be
put on a spectacle frame.
23.1 (b) 9 9 of the standard only meets
the requirements of Annex I,
GSPR 23.1 (b) of the Regulation
in respect of the labelling to be
put on a spectacle frame.
23.2 (c) 10.4 10.4 of the standard only
partially meets the
requirements of Annex I,
GSPR 23.2 (c) of the Regulation
in respect of the
manufacturer's or agent's
name and address.
Spectacle frames do not have
labels but are usually mounted
on an accompanying card. If
not, information can be
provided on the packaging or
in catalogues or electronic
database.
Table ZA.2 — Normative references from clause 2 of this document and their
corresponding European publications
Column 1 Column 2 Column 3 Column 4
Reference in International
Title Corresponding European
Clause 2 Standard edition
Standard Edition
ISO 105-A02:1993
ISO 105-
EN 20105-A02:1994
A02:1993/Cor Textiles — Tests for colour
ISO 105-A02 1:1997 fastness — Part A02: Grey scale
For applicable standard
for assessing change in colour
edition see Column 2.
ISO 105-
A02:1993/Cor
2:2005
Water for analytical laboratory
ISO 3696:1987
ISO 3696 use — Specification and test EN ISO 3696:1995

methods
Ophthalmic optics — Spectacle
ISO 7998 ISO 7998:2005 frames — Lists of equivalent EN ISO 7998:2005
terms and vocabulary
Ophthalmic optics — Spectacle
ISO 8624 ISO 8624:2020 frames — Measuring system and EN ISO 8624:2020
vocabulary
Optics and optical instruments —
ISO 11380 ISO 11380:1994 EN ISO 11380:1996
Ophthalmic optics — Formers
Ophthalmic optics — Spectacle
ISO 11381 ISO 11381:2016 EN ISO 11381:2016
frames — Screw threads
Ophthalmic optics — Reference
EN 16128:2015
method for the testing of spectacle
EN 16128 None
Note – a revision is at the
frames and sunglasses for Nickel
FprEN stage.
release
EN ISO 14971:2019
Medical devices. Application of
EN ISO
ISO 14971 risk management to medical
EN ISO
14971:2019
devices
14971:2019/A11:2021
The documents listed in the Column 1 of Table ZA.2, in whole or in part, are normatively referenced in
this document, i.e. are indispensable for its application. The achievement of the presumption of
conformity is subject to the application of the edition of Standards as listed in Column 4 or, if no
European Standard Edition exists, the International Standard Edition given in Column 2 of Table ZA.2.
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
International
Standard
ISO 12870
Fifth edition
Ophthalmic optics — Spectacle frames
2024-11
— Requirements and test methods
Optique ophtalmique — Montures de lunettes — Exigences et
méthodes d'essai
Reference number
ISO 12870:2024(en) © ISO 2024
ISO 12870:2024(en)
© ISO 2024
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 12870:2024(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General terms .2
3.2 Types of frame . . .3
3.3 Term describing frame materials .4
4 Requirements . 5
4.1 General .5
4.2 Construction .7
4.3 Risk management .7
4.4 Biological compatibility .7
4.5 Nickel release (optional) .8
4.6 Clinical evaluation .8
4.7 Measurement system .8
4.8 Dimensional tolerances on nominal size .8
4.9 Tolerance on screw threads (optional) .9
4.10 Dimensional stability at elevated temperature .9
4.11 Resistance to perspiration .9
4.12 Mechanical stability .10
4.12.1 Bridge deformation .10
4.12.2 Lens retention characteristics .10
4.12.3 Endurance .11
4.13 Resistance to ignition .11
4.14 Resistance to optical radiation (optional) .11
5 Selection of test samples .11
5.1 General .11
5.2 Testing for nickel release .11
5.3 Change in spectacle frame model .11
6 Preparation and conditioning of test samples .12
6.1 Test lenses . 12
6.2 Sample conditioning and test conditions . 12
7 Testing, inspection and conformity .12
7.1 Testing . 12
7.2 Inspection and examination . 13
7.3 Conformity . 13
8 Test methods . 14
8.1 General .14
8.2 Test for dimensional stability.14
8.2.1 Apparatus .14
8.2.2 Procedure . 15
8.3 Test for resistance to perspiration . 15
8.3.1 Apparatus and reagents . 15
8.3.2 Procedure .16
8.4 Bridge deformation and lens retention .16
8.4.1 Apparatus .16
8.4.2 Procedure .17
8.5 Endurance test .18
8.5.1 Apparatus .18
8.5.2 Procedure .19
8.6 Test for resistance to ignition . 20
8.6.1 Apparatus . 20

iii
ISO 12870:2024(en)
8.6.2 Procedure . 20
8.7 Test for resistance to optical radiation .21
8.7.1 Apparatus .21
8.7.2 Procedure .21
9 Marking . .22
10 Additional information to be supplied by the manufacturer or other person placing the
product on the market .23
11 Reference to this document.23
Annex A (informative) Recommendations for the design of spectacle frames .24
Annex B (informative) Chemicals that can be harmful to health .26
Annex C (informative) European requirements and legislation on nickel release .27
Annex D (informative) Examples of layout of test equipment .28
Annex E (normative) Long wavelength pass filter .31
Annex F (informative) Identification marking or labelling of handling requirements (optional) .35
Bibliography .36

iv
ISO 12870:2024(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).
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 on 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 the following URL:
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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 170, Ophthalmic optics, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 12870:2016), which has been technically
revised.
The main changes are as follows:
— rimmed clip-ons, prescription inserts, and frames made by additive manufacture are now included in
the scope;
— additional terms and definitions;
— clarification of the tests to be applied for the biological properties of custom-made frames in Table 1 (in 4.1);
— some re-arrangement of and additional text in 4.2;
— simplification of the text in 4.2 to make it more general, and addition of a note on magnets;
— additional wording has been added to 4.12.3 and 8.5 to emphasize that the apparatus prevents rotational
movements of the "fixed” side;
— minor changes to 4.2, 6.1, 8.5.2.3, 8.6, 8.7 (with a new Annex E), Clause 9 and 10.3;
— 4.5 and 4.9 have been made optional, while the original 10.5 and 10.6 are now in a Note to 4.2;
— 10.1 refers to an informative Annex F on frame handling information.
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.

v
International Standard ISO 12870:2024(en)
Ophthalmic optics — Spectacle frames — Requirements and
test methods
1 Scope
This document specifies fundamental requirements and their test methods for unglazed spectacle frames
designed for use with prescription lenses. It is applicable to spectacle frames at the point of sale by the
manufacturer or supplier to the retailer.
This document is applicable to:
— all mass-produced spectacle frame types, including rimless mounts, semi-rimless mounts and folding
spectacle frames;
— spectacle frames made with additive manufacturing, for example, 3D printing;
— spectacle frames made from natural organic materials;
— the frame or mount of clip-ons designed specifically for attachment to particular models of spectacle
frame, but not to their lenses or filters to which ISO 16034 or ISO 12312-1 apply;
— prescription inserts designed for attachment to particular models of, for example, eye protector, sunglass
or diving mask.
Parts of this document are applicable to custom-made frames – see 3.1.3 and Table 1.
NOTE See Annex A for recommendations on the design of spectacle frames and terms to be used when describing
metal frames.
This document is not applicable to spectacle frames used in eye protection, where ISO 16321-1 applies, or to
sunglasses with afocal filters, where ISO 12312-1 applies.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 105-A02, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 7998, Ophthalmic optics — Spectacle frames — Lists of equivalent terms and vocabulary
ISO 8624, Ophthalmic optics — Spectacle frames — Measuring system and vocabulary
ISO 11380, Optics and optical instruments — Ophthalmic optics — Formers
ISO 11381, Ophthalmic optics — Spectacle frames — Screw threads
EN 16128, Ophthalmic optics — Reference method for the testing of spectacle frames and sunglasses for Nickel release

ISO 12870:2024(en)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7998 and ISO 8624 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 General terms
3.1.1
spectacle frame model
spectacle frame produced to a common design, using the same materials (but not necessarily the same
pigmentation) and surface treatment
3.1.2
mass-produced frame
frame that is based on standardized dimensions/designs and is typically produced in a continuous
production run or homogenous batch
Note 1 to entry: A homogeneous batch will be made to the same specifications using the same machine/ equipment set-up.
Note 2 to entry: A mass-produced frame is not designed for a particular individual, but may have to be adapted to fit
the wearer's facial features during dispensing, and will be adapted by fitting it with spectacle lenses.
[SOURCE: Adapted from IMDRF N49:2018, 4.7 and 4.8]
3.1.3
custom-made frame
frame made to a written request from a person authorized by national law for the sole use of a particular
individual to address the specific anatomo-physiological features, pathological condition or frame colour or
design request of the individual for whom it is intended
Note 1 to entry: Frames that are patient-matched, adaptable or mass-produced shall not be considered to be custom-made.
Note 2 to entry: A custom-made frame is intended for a case where an individual’s specific needs cannot be met, or
cannot be met at the appropriate level of performance, by an alternative device available on the market.
[SOURCE: IMDRF N49:2018, 4.2, definition abbreviated to fit ISO Rules.]
3.1.4
principal component
rims, bridge, lugs and sides
Note 1 to entry: For a frame of which the front is made of plastic materials, the rims, bridge and lugs can be machined
from or moulded in a single piece of material.
Note 2 to entry: Other components of a frame, which might be called non-principal components, include joints, sprung
joints, screws, closing blocks, solders, washers, bushings, nuts of screw assemblies, dowel pins, metal cores for plastics
sides, plastics nose pads, plastics hoods, plastics end covers, plastics inner winding and cores of curl sides.
3.1.5
trained observer
person trained in the testing of frames who has a binocular decimal visual acuity of at least 1,0 (6/6 or 20/20)
and wearing the appropriate refractive correction, if necessary, for the observation distance of the test
[SOURCE: ISO 4007:2018, 3.11.1, modified by replacing "with" by "who has" and "eye and face protectors"
with "frames.]
ISO 12870:2024(en)
3.1.6
test lens
lens as described in 6.1 to be mounted into the frame for testing the frame's requirements
3.2 Types of frame
3.2.1
plastics frame
frame of which the principal components (3.1.4) of the front are made of a plastics material
3.2.2
frame made of natural organic materials
frame of which the principal components (3.1.4) of the frame are made of natural organic materials (3.3.1)
Note 1 to entry: For the purposes of terminology, a frame from natural organic materials has the same construction as
a plastics frame, the material having some properties similar to those of a plastic material.
3.2.3
metal frame
frame of which the principal components (3.1.4) of the frame are made of metal
3.2.4
folding frame
frame hinged at the bridge, and possibly in the sides, so as to fold into a small space
3.2.5
combination frame
frame of which the front and/or sides are made of at least two different categories of material
Note 1 to entry: The non-principal components (see 3.1.4, Note2 to entry) are excluded from consideration in this
definition.
Note 2 to entry: Categories of material include, but are not limited to, metal, plastic and natural organic materials.
Note 3 to entry: This includes the original meaning of the term when the combination depended only on the
construction of the front.
3.2.6
mount for rimless and semi-rimless spectacles
mount of which the front is made of metal or of a plastic material or a natural organic material (3.3.1) having
similar properties, or a combination of both, and in which the lenses are not or only partially surrounded by
a protecting rim
3.2.7
mixed frame
frame in which the components liable to come into close and prolonged contact with the skin are made of at
least two different categories of material
Note 1 to entry: All components are included, both principal components (3.1.4) and non-principal components (see
3.1.4, Note2 to entry).
Note 2 to entry: Categories of material include, but are not limited to, metal, plastic and natural organic materials.
Note 3 to entry: This definition is used only for descriptions for testing purposes, not for frame categorization when
marketing or in catalogues.
3.2.8
clip-on
pair of lenses/filters or a one-piece lens or filter designed to clip on over the front of or behind a pair of
spectacles
Note 1 to entry: For the purposes of this document, the term is restricted to designs with a rim that fits on the front.

ISO 12870:2024(en)
[SOURCE: ISO 4007:2018, 3.5.1.14, modified by the addition of the note 1 to entry.]
3.2.9
prescription insert
device for carrying prescription lenses that is intended to be attached on the inside of the protector between
the eyes of the wearer and the protective lens
Note 1 to entry: Prescription inserts can be used with eye and face protectors for occupational use, sunglasses, diving
goggles, augmented reality devices, etc.
[SOURCE: ISO 4007:2018, 3.5.1.15, modified by the addition of the note to entry.]
3.3 Term describing frame materials
3.3.1
natural organic material
material that has not been synthesized from other raw organic materials and, when processed, remains
essentially in its original state
Note 1 to entry: Processing in this case is defined as cutting, shaping, laminating, bonding, bending, polishing and
heating.
EXAMPLE Natural horn, bamboo and wood.
3.3.2
rolled-gold covering
covering achieved using a method by which a layer of gold alloy is bonded to a sheet or bar of base metal, the
whole then being subjected to reduction by rolling
Note 1 to entry: The proportion of gold is designated by its nominal thickness, in micrometres, and by the fineness of
the gold alloy covering the base metal, for example, 40 µm nominal thickness of 500 fineness gold alloy. In accordance
with ISO 3160-1, the range of nominal thicknesses, in micrometres, are 5 µm, 10 µm, 20 µm, 40 µm and 80 µm, with
a tolerance of −20 %, and the fineness is defined as the pro
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