ISO/FDIS 8980-4
(Main)Ophthalmic optics — Uncut finished spectacle lenses — Part 4: Specifications and test methods for the properties of anti-reflective coatings and hydrophobic coatings
Ophthalmic optics — Uncut finished spectacle lenses — Part 4: Specifications and test methods for the properties of anti-reflective coatings and hydrophobic coatings
ISO 8980-4:2006 specifies optical and non optical requirements, including durability, and test methods for anti-reflective coatings on spectacle lenses. ISO 8980-4:2006 does not deal with the following topics: transmittance and absorbtance; the colour of the reflected light.
Optique ophtalmique — Verres de lunettes finis non détourés — Partie 4: Spécifications et méthodes d'essai relatives aux propriétés des traitements antireflet et hydrophobes
L'ISO 8980-4:2006 spécifie les exigences optiques et non optiques, y compris la durabilité et les méthodes d'essai relatives aux traitements antireflet des verres de lunettes. L'ISO 8980-4:2006 ne traite pas les aspects suivants: le facteur de transmission et l'absorbance; la couleur de la lumière réfléchie.
General Information
- Status
- Not Published
- Technical Committee
- ISO/TC 172/SC 7 - Ophthalmic optics and instruments
- Drafting Committee
- ISO/TC 172/SC 7/WG 3 - Spectacle lenses
- Current Stage
- 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
- Start Date
- 07-Apr-2026
- Completion Date
- 07-Apr-2026
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 18-May-2024
Overview
ISO/FDIS 8980-4:2026 is an international standard developed by the International Organization for Standardization (ISO) that specifies requirements and test methods for anti-reflective (AR) and hydrophobic coatings applied to uncut, finished spectacle lenses. The standard focuses on both optical and non-optical performance-including durability of coatings-used in ophthalmic optics. It is part of the ISO 8980 series, which establishes quality and performance benchmarks for spectacle lenses.
This document does not cover transmittance, absorptance, or the color of reflected light, and excludes testing found in other parts of the ISO 8980 series. Instead, ISO/FDIS 8980-4 centers on ensuring that anti-reflective and hydrophobic coatings maintain their intended properties over time, using standardized test methods for reflectance, water repellency, and resistance to environmental and mechanical stresses.
Key Topics
- Anti-reflective Coatings: Sets specifications and testing for luminous and mean reflectances, ensuring coatings reduce glare and unwanted reflections effectively without deterioration over time.
- Hydrophobic Coatings: Establishes minimum requirements for water repellency, measured by the static contact angle, enhancing lens cleanliness and ease of maintenance.
- Durability and Adhesion: Defines durability as resistance to deterioration from factors such as rubbing, heat, UV radiation, and humidity. Specifies test methods for adhesion, ensuring coatings remain intact during use.
- Standardized Test Methods: Provides precise procedures for measuring optical properties (reflectance, contact angle) and for simulating wear through environmental cycling and controlled mechanical abrasion.
- Sample Preparation and Handling: Outlines preparation protocols for test samples to ensure consistent, reproducible results.
Applications
ISO/FDIS 8980-4 is essential for a range of stakeholders in the ophthalmic optics industry:
- Spectacle Lens Manufacturers: Assists manufacturers in designing and verifying lenses that meet international performance and durability expectations for AR and hydrophobic coatings.
- Quality Assurance Laboratories: Provides testing protocols for validating compliance with global standards, supporting product certification and regulatory approval.
- Suppliers and Retailers: Ensures that claimed hydrophobic and AR performance standards are substantiated, improving product reliability and consumer trust.
- Regulatory Authorities: Enables consistent regulatory assessment for coated spectacle lenses intended for global markets, ensuring safety and efficacy.
Typical applications covered by this standard include prescription eyeglasses, sunglasses, and specialty lenses requiring enhanced optical performance and surface durability.
Related Standards
ISO/FDIS 8980-4 is part of a family of standards addressing ophthalmic lens quality:
- ISO 8980-1: Specifications for single-vision and multifocal uncut finished spectacle lenses.
- ISO 8980-2: Specifications for power-variation (progressive) lenses.
- ISO 8980-3: Test methods for optical transmittance of spectacle lenses.
- ISO 13666: Provides the terminology and definitions used throughout the ophthalmic optics industry.
- ISO 14889: Lays out the fundamental requirements for uncut finished spectacle lenses.
These related standards together ensure comprehensive quality control and safety across the spectacle lens manufacturing process.
Keywords: ISO 8980-4, anti-reflective coating, hydrophobic coating, spectacle lenses, ophthalmic optics, lens durability, reflectance testing, lens coatings, lens quality standard, ISO standards for optics.
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Frequently Asked Questions
ISO/FDIS 8980-4 is a draft published by the International Organization for Standardization (ISO). Its full title is "Ophthalmic optics — Uncut finished spectacle lenses — Part 4: Specifications and test methods for the properties of anti-reflective coatings and hydrophobic coatings". This standard covers: ISO 8980-4:2006 specifies optical and non optical requirements, including durability, and test methods for anti-reflective coatings on spectacle lenses. ISO 8980-4:2006 does not deal with the following topics: transmittance and absorbtance; the colour of the reflected light.
ISO 8980-4:2006 specifies optical and non optical requirements, including durability, and test methods for anti-reflective coatings on spectacle lenses. ISO 8980-4:2006 does not deal with the following topics: transmittance and absorbtance; the colour of the reflected light.
ISO/FDIS 8980-4 is classified under the following ICS (International Classification for Standards) categories: 11.040.70 - Ophthalmic equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO/FDIS 8980-4 has the following relationships with other standards: It is inter standard links to FprEN ISO 8980-4, ISO 8980-4:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/FDIS 8980-4 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/TC 172/SC 7
Ophthalmic optics — Uncut finished
Secretariat: DIN
spectacle lenses —
Voting begins on:
2026-04-07
Part 4:
Specifications and test methods
Voting terminates on:
2026-06-02
for the properties of anti-reflective
coatings and hydrophobic coatings
Optique ophtalmique — Verres de lunettes finis non détourés —
Partie 4: Spécifications et méthodes d'essai relatives aux
propriétés des traitements antireflet et hydrophobes
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 172/SC 7
Ophthalmic optics — Uncut finished
Secretariat: DIN
spectacle lenses —
Voting begins on:
Part 4:
Specifications and test methods
Voting terminates on:
for the properties of anti-reflective
coatings and hydrophobic coatings
Optique ophtalmique — Verres de lunettes finis non détourés —
Partie 4: Spécifications et méthodes d'essai relatives aux
propriétés des traitements antireflet et hydrophobes
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 SUPPOR TING DOCUMENTATION.
© ISO 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 General requirements .2
4.2 Usable diameter of coated area .3
4.3 Luminous and mean reflectances . .3
4.4 Water repellency .3
4.5 Durability .3
5 Testing. 3
5.1 General .3
5.2 Anti-reflective coating .3
5.2.1 Method of determination of spectral reflectance .3
5.2.2 Determination of spectral reflectance values.4
5.2.3 Determination of luminous reflectance .4
5.2.4 Determination of mean reflectance .4
5.2.5 Information to be made available on request .4
5.3 Hydrophobic coating .5
5.3.1 Contact angle measurement apparatus .5
5.3.2 Water for testing . .5
5.3.3 Sample.5
5.3.4 Procedure .5
5.4 Determination of durability . .6
5.4.1 Equipment and consumables. .6
5.4.2 Test specimens .6
5.4.3 Test method: environmental cycling combined with rubbing sequences .6
5.4.4 Evaluation . .7
6 Reference to this document. 7
Annex A (informative) Significance of ρ and ρ in the description of anti-reflective coated lenses. 8
v M
Annex B (normative) Environmental sequence . 9
Annex C (normative) Rubbing sequence procedure .11
Annex D (normative) Evaluation of the surface quality .13
Annex E (informative) Examples of lenses passing and failing the visual evaluation .15
Annex F (informative) Examples of environmental sequence .16
Annex G (informative) Examples of a rubbing tool and components.18
Annex H (informative) Example of a contact angle test apparatus .20
Bibliography .22
iii
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, 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 third edition cancels and replaces the second edition (ISO 8980-4:2006), which has been technically
revised.
The main changes are as follows:
— the title has been updated;
— the scope has been expanded to include properties of hydrophobic coatings;
— the scope has been defined to exclude requirements and test methods found in other standards within
the ISO 8980 series;
— normative references, terms and definitions relating to hydrophobic properties have been added in
Clause 2 and 3;
— test methods for properties of hydrophobic coatings have been added in Clause 5 and informative and
normative Annexes C, D and E.
A list of all parts in the ISO 8980 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
FINAL DRAFT International Standard ISO/FDIS 8980-4:2026(en)
Ophthalmic optics — Uncut finished spectacle lenses —
Part 4:
Specifications and test methods for the properties of anti-
reflective coatings and hydrophobic coatings
1 Scope
This document specifies optical and non-optical requirements, and the test methods for anti-reflective and
hydrophobic properties of coatings on spectacle lenses.
This document does not apply to the following topics:
— requirements and test methods incorporated in other ISO 8980 series standards;
— the colour of the reflected light.
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 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 8980-1, Ophthalmic optics — Uncut finished spectacle lenses — Part 1: Specifications for single-vision and
multifocal lenses
ISO 8980-2, Ophthalmic optics — Uncut finished spectacle lenses — Part 2: Specifications for power-variation
lenses
ISO 8980-3, Ophthalmic optics — Uncut finished spectacle lenses — Part 3: Transmittance specifications and
test methods
ISO 13666:2019, Ophthalmic optics — Spectacle lenses — Vocabulary
ISO 14889, Ophthalmic optics — Spectacle lenses — Fundamental requirements for uncut finished lenses
3 Terms and definitions
For the purposes of this document, the following terms and definitions given in ISO 13666 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
durability
ability to resist deterioration of its reflectance characteristics, over time, in
intended use
Note 1 to entry: The major factors contributing to deterioration of an anti-reflective coating are rubbing, heat, UV
radiation and humidity.
Note 2 to entry: The main failure affecting the durability of anti-reflective properties is a loss of adhesion. Therefore,
requirements of this document are related to anti-reflective coating adhesion.
3.2
static contact angle
θ
angle in the vertical plane between the solid surface of the specimen and the tangent to the surface of a
droplet of liquid resting on the surface at the interface of air, liquid and the substrate under normal air
conditions
Note 1 to entry: The static contact angle is illustrated in Figure 1.
Key
1 surface of the droplet of liquid
2 surface of the lens
Figure 1 — Illustration of contact angle
3.3
hydrophobic coating
coating on the top of the lens surface or surface coating layers having water repellent properties
Note 1 to entry: A number of trade names, such as self-cleaning, hydrophobic, water repellent, waterproof are applied
to this type of coating.
Note 2 to entry: It is generally considered that a hydrophobic surface has a static water contact angle that is greater
than or equal to 90°.
Note 3 to entry: Hydrophobic coatings are frequently used to provide anti-fouling properties, i.e. ease of cleaning
4 Requirements
4.1 General requirements
Anti-reflective coated and hydrophobic coated lenses shall comply with the general requirements concerning
the finished spectacle lens specifications in ISO 8980-1, ISO 8980-3 and ISO 14889. This document applies to
lenses that are antireflective coated or hydrophobic coated, or a combination of both.
NOTE 1 For further information on the properties of anti-reflective coatings, see Annex A.
NOTE 2 The reflectance characteristics of an anti-reflective coating should not significantly change due to
deterioration of the coating in intended use.
4.2 Usable diameter of coated area
The usable diameter of the coated area for uncut finished spectacle lenses shall be ≥(d -4) mm, where d is
n n
the nominal diameter of the lens, in millimetres, indicated by the manufacturer.
4.3 Luminous and mean reflectances
The luminous reflectance, ρ , and the mean reflectance, ρ , of an anti-reflective coated lens shall be
V M
determined by the method specified in 5.2.2.
If the manufacturer specifies values for luminous and mean reflectances, the measured values shall not
exceed the specified values by more than 20 %.
When determined as described in 5.2.3, the luminous reflectance, ρ , of any anti-reflective coated lens
V
surface shall be less than 2,5 %.
4.4 Water repellency
The static contact angle of water for the front surface of a lens with hydrophobic coating shall be determined
by the method specified in 5.3.
For lenses for which the hydrophobic property is claimed, the mean static contact angle of water shall be
greater than or equal to 90°.
4.5 Durability
Under the conditions described in the test method given in 5.4, five consecutively tested lenses shall be free
of significant loss of adhesion as defined in 5.4.4.
A product meets the durability requirements of this document if all five lenses tested satisfy this criterion.
5 Testing
5.1 General
This clause specifies type test methods for anti-reflective and hydrophobic coatings on spectacle lenses. At
least 24 h shall elapse after coating before any type test is carried out. Lenses shall be stored at a temperature
of 20 °C to 26 °C.
5.2 Anti-reflective coating
5.2.1 Method of determination of spectral reflectance
5.2.1.1 Apparatus
Use any dual-beam or single-beam spectrophotometer with an incident angle not larger than 17° and
with a measurement accuracy sufficient to give the value of the spectral reflectance at all wavelengths, λ,
between 380 nm and 780 nm with an uncertainty of less than 0,1 % (for example an anti-reflective coating
quoted as having 0,5 % reflectance may be measured as having 0,4 % to 0,6 % reflectance). The wavelength
increment of measurement shall not be more than 5 nm. The spectral bandwidth (full width at half maximum,
FWHM) shall not exceed 5 nm.
The calibration specimen shall have a surface curvature within 0,50 D of that of the spectacle lens to be
tested. The back surface of this specimen shall be designed such that unwanted reflections will be minimized
(e.g. both frosted and painted matt black). The calibration specimen shall be of known refractive index n(λ)
(uncertainty Δn < 0,001) and have no coating (which could affect its surface reflective properties). The
surface shall be cleaned.
5.2.1.2 Spectacle lens preparation
The surface of the spectacle lens under test shall have a radius of curvature greater than 80 mm. The back
surface of the lens shall be designed such that no reflection will interfere with the measurement (e.g. both
frosted and painted matt black). The surface shall be cleaned.
5.2.1.3 Measurement
Insert the calibration specimen and calibrate the spectrophotometer to give a value of 100 %. Then insert
the spectacle lens. The spectrophotometer will give the value of the spectacle lens to calibration specimen
spectral reflectance ratio R (λ), in %. By using this technique, any error due to surface curvature will be
T
minimized.
Measure the spectacle lens to calibration specimen spectral reflectance ratio over the range 380 nm
to 780 nm. The step width shall not exceed 5 nm.
5.2.2 Determination of spectral reflectance values
The value of the calibration specimen surface spectral reflectance value R (λ) is calculated theoretically
C
from the refractive index, as given by Formula (1):
n 1
R (1)
C
n 1
where
R (λ) is the calibration specimen surface spectral reflectance;
C
n(λ) is refractive index
The value of the spectacle lens surface spectral reflectance is calculated by multiplying the calibration
specimen spectral reflectance value by the spectacle lens-to-calibration specimen spectral reflectance ratio,
as given by Formula (2):
ρ(λ) = R (λ) × R (λ) (2)
C T
where
ρ(λ) is the value of the spectacle lens surface spectral reflectance;
R (λ) is the calibration specimen spectral reflectance value;
C
R (λ) is the spectacle lens-to-calibration specimen spectral reflectance ratio.
T
5.2.3 Determination of luminous reflectance
The luminous reflectance, ρ , shall be calculated using both the spectral reflectance values, ρ(λ), and the
V
equation given in ISO 13666:2019, 3.17.16.
5.2.4 Determination of mean reflectance
The mean reflectance, ρ , shall be calculated using both the spectral reflectance values, ρ(λ), and the
M
equation given in ISO 13666: 2019, 3.17.17.
5.2.5 Information to be made available on request
The values of the luminous reflectance, ρ , the mean reflectance, ρ , and the spectral reflectance curve shall
V M
be made available on request for a typical surface with a radius of curvature not less than 80 mm.
5.3 Hydrophobic coating
5.3.1 Contact angle measurement apparatus
Equipment that can measure the static contact angle shall be used. This can be achieved with
macrophotography of the droplet, or projection of the droplet onto a screen. An example of a projection
apparatus is given in Annex H. If using a projection apparatus, direct measurement of the image on the
screen or after photography can be used. Alternative apparatus based on image acquisition and processing
may be used to calculate the static contact angle.
5.3.2 Water for testing
The water used for the test shall be stored in the same environment as the test site for at least one day.
-1
Deionized water shall be used and it shall be verified that the electrical conductivity is less than 2 μS·cm
before testing.
NOTE The water for testing can be Grade 2 of ISO 3696.
5.3.3 Sample
5.3.3.1 Requirements for the sample spectacle lens
The sample shall be a spectacle lens of minimum diameter 30 mm or square of minimum size 20 mm × 20 mm.
The v
...
ISO/TC 172/SC 7
Secretariat: DIN
Date: 2026-03-04xx
Ophthalmic optics — Uncut finished spectacle lenses — —
Part 4:
Specifications and test methods for the properties of anti--reflective
coatings and hydrophobic coatings
Optique ophtalmique — Verres de lunettes finis non détourés —
Partie 4: Spécifications et méthodes d'essai relatives aux propriétés des traitements antireflet et hydrophobes
FDIS stage
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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
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 General requirements . 2
4.2 Usable diameter of coated area . 3
4.3 Luminous and mean reflectances . 3
4.4 Water repellency . 3
4.5 Durability . 3
5 Testing . 3
5.1 General . 3
5.2 Anti-reflective coating . 3
5.3 Hydrophobic coating . 5
5.4 Determination of durability . 6
6 Reference to this document . 7
Annex A (informative) Significance of ρ and ρ in the description of anti-reflective coated
v M
lenses . 8
Annex B (normative) Environmental sequence . 10
Annex C (normative) Rubbing sequence procedure . 12
Annex D (normative) Evaluation of the surface quality . 14
Annex E (informative) Examples of lenses passing and failing the visual evaluation . 16
Annex F (informative) Examples of environmental sequence . 17
Annex G (informative) Examples of a rubbing tool and components . 19
Annex H (informative) Example of a contact angle test apparatus . 21
Bibliography . 23
iii
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., 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 third edition cancels and replaces the second edition (ISO 8980-4:2006), which has been technically
revised.
The main changes are as follows:
— — the title has been updated;
— — the scope has been expanded to include properties of hydrophobic coatings;
— — the scope has been defined to exclude requirements and test methods found in other standards within
the ISO 8980 series;
— — normative references, terms and definitions relating to hydrophobic properties have been added in
Clause 2Clause 2 and 33;;
— — test methods for properties of hydrophobic coatings have been added in Clause 5Clause 5 and
informative and normative Annexes CAnnexes C, D, D and EE.
A list of all parts in the ISO 8980 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
Ophthalmic optics — Uncut finished spectacle lenses — —
Part 4:
Specifications and test methods for the properties of anti--reflective
coatings and hydrophobic coatings
1 Scope
This document specifies optical and non-optical requirements, and the test methods for anti-reflective and
hydrophobic properties of coatings on spectacle lenses.
This document does not apply to the following topics:
— — requirements and test methods incorporated in other ISO 8980 series standards;
— — the colour of the reflected light.
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 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 8980--1, Ophthalmic optics — Uncut finished spectacle lenses — Part 1: Specifications for single-vision and
multifocal lenses
ISO 8980--2, Ophthalmic optics — Uncut finished spectacle lenses — Part 2: Specifications for power-variation
lenses
ISO 8980--3, Ophthalmic optics — Uncut finished spectacle lenses — Part 3: Transmittance specifications and
test methods
ISO 13666:2019, Ophthalmic optics — Spectacle lenses — Vocabulary
ISO 14889, Ophthalmic optics — Spectacle lenses — Fundamental requirements for uncut finished lenses
3 Terms and definitions
For the purposes of this document, the following terms and definitions given in ISO 13666 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 3.1
durability
ability to resist deterioration of its reflectance characteristics, over time, in
intended use
Note 1 to entry: The major factors contributing to deterioration of an anti-reflective coating are rubbing, heat, UV
radiation and humidity.
Note 2 to entry: The main failure affecting the durability of anti -reflective properties is a loss of adhesion. Therefore,
requirements of this document are related to anti-reflective coating adhesion.
3.2 3.2
static contact angle
θ
angle in the vertical plane between the solid surface of the specimen and the tangent to the surface of a droplet
of liquid resting on the surface at the interface of air, liquid and the substrate under normal air conditions
Note 1 to entry: The static contact angle is illustrated in Figure 1Figure 1.
8980-4_ed3fig1.EPS
Key
1 surface of the droplet of liquid
2 surface of the lens
Figure 1 — Illustration of contact angle
3.3 3.3
hydrophobic coating
coating on the top of the lens surface or surface coating layers having water repellent properties
Note 1 to entry: A number of trade names, such as self-cleaning, hydrophobic, water repellent, waterproof, etc., are
applied to this type of coating.
Note 2 to entry: It is generally considered that a hydrophobic surface has a static water contact angle that is greater than
or equal to 90°.
Note 3 to entry: Hydrophobic coatings are frequently used to provide anti-fouling properties, i.e. ease of cleaning
4 Requirements
4.1 General requirements
Anti-reflective coated and hydrophobic coated lenses shall comply with the general requirements concerning
the finished spectacle lens specifications in ISO 8980--1, ISO 8980--3 and ISO 14889. This document applies
to lenses that are antireflective coated or hydrophobic coated, or a combination of both.
NOTE 1 For further information on the properties of anti-reflective coatings, see Annex AAnnex A.
NOTE 2 The reflectance characteristics of an anti-reflective coating should not significantly change due to
deterioration of the coating in intended use.
4.2 Usable diameter of coated area
The usable diameter of the coated area for uncut finished spectacle lenses shall be ≥(d -4) mm, where d is
n n
the nominal diameter of the lens, in millimetres, indicated by the manufacturer.
4.3 Luminous and mean reflectances
The luminous reflectance, ρ , and the mean reflectance, ρ , of an anti-reflective coated lens shall be
V M
determined by the method specified in 5.2.25.2.2.
If the manufacturer specifies values for luminous and mean reflectances, the measured values shall not exceed
the specified values by more than 20 %.
When determined as described in 5.2.35.2.3,, the luminous reflectance, ρ , of any anti-reflective coated lens
V
surface shall be less than 2,5 %.
4.4 Water repellency
The static contact angle of water for the front surface of a lens with hydrophobic coating shall be determined
by the method specified in 5.35.3.
For lenses for which the hydrophobic property is claimed, the mean static contact angle of water shall be
greater than or equal to 90°.
4.5 Durability
Under the conditions described in the test method given in 5.45.4,, five consecutively tested lenses shall be
free of significant loss of adhesion as defined in 5.4.45.4.4.
A product meets the durability requirements of this document if all five lenses tested satisfy this criterion.
5 Testing
5.1 General
This clause specifies type test methods for anti-reflective and hydrophobic coatings on spectacle lenses. At
least 24 h shall elapse after coating before any type test is carried out. Lenses shall be stored at a temperature
of 20 °C to 26 °C.
5.2 Anti-reflective coating
5.2.1 Method of determination of spectral reflectance
5.2.1.1 Apparatus
Use any dual-beam or single-beam spectrophotometer with an incident angle not larger than 17° and with a
measurement accuracy sufficient to give the value of the spectral reflectance at all wavelengths, λ,
between 380 nm and 780 nm with an uncertainty of less than 0,1 % (for example, an anti--reflective coating
quoted as having 0,5 % reflectance may be measured as having 0,4 % to 0,6 % reflectance). The wavelength
increment of measurement shall not be more than 5 nm. The spectral bandwidth (full width at half maximum,
FWHM) shall not exceed 5 nm.
The calibration specimen shall have a surface curvature within 0,50 D of that of the spectacle lens to be tested.
The back surface of this specimen shall be designed such that unwanted reflections will be minimized (e.g.
both frosted and painted matt black). The calibration specimen shall be of known refractive index n(λ)
(uncertainty Δn < 0,001) and have no coating (which could affect its surface reflective properties). The surface
shall be cleaned.
5.2.1.2 Spectacle lens preparation
The surface of the spectacle lens under test shall have a radius of curvature greater than 80 mm. The back
surface of the lens shall be designed such that no reflection will interfere with the measurement (e.g. both
frosted and painted matt black). The surface shall be cleaned.
5.2.1.3 Measurement
Insert the calibration specimen and calibrate the spectrophotometer to give a value of 100 %. Then insert the
spectacle lens. The spectrophotometer will give the value of the spectacle lens to calibration specimen spectral
reflectance ratio R (λ), in %. By using this technique, any error due to surface curvature will be minimized.
T
Measure the spectacle lens to calibration specimen spectral reflectance ratio over the range 380 nm
to 780 nm. The step width shall not exceed 5 nm.
5.2.2 Determination of spectral reflectance values
The value of the calibration specimen surface spectral reflectance value R (λ) is calculated theoretically from
C
the refractive index, as given by Formula (1).:
(1)
𝑛𝑛(𝜆𝜆)−1
𝑅𝑅 (𝜆𝜆) = [ ] (1)
𝐶𝐶
𝑛𝑛(𝜆𝜆)+1
where
R (λ) is the calibration specimen surface spectral reflectance;
C
n(λ) is refractive index
The value of the spectacle lens surface spectral reflectance is calculated by multiplying the calibration
specimen spectral reflectance value by the spectacle lens-to-calibration specimen spectral reflectance ratio,
as given by Formula (2)::
ρ(λ) = R (λ) × R (λ) (2)
C T
where
ρ(λ) is the value of the spectacle lens surface spectral reflectance;
RC(λ) is the calibration specimen spectral reflectance value;
RT(λ) is the spectacle lens-to-calibration specimen spectral reflectance ratio.
5.2.3 Determination of luminous reflectance
The luminous reflectance, ρ , shall be calculated using both the spectral reflectance values, ρ(λ)), and the
V
equation given in ISO 13666:2019, 3.17.16.
5.2.4 Determination of mean reflectance
The mean reflectance, ρ , shall be calculated using both the spectral reflectance values, ρ(λ)), and the equation
M
given in ISO 13666: 2019, 3.17.17.
5.2.5 Information to be made available on request
The values of the luminous reflectance, ρ and, the mean reflectance, ρ , and the spectral reflectance curve
V M
shall be made available on request for a typical surface with a radius of curvature not less than 80 mm.
5.3 Hydrophobic coating
5.3.1 Contact angle measurement apparatus
Equipment that can measure the static contact angle shall be used. This can be achieved with
macrophotography of the droplet, or projection of the droplet onto a screen. An example of a projection
apparatus is given in Annex HAnnex H. If using a projection apparatus, direct measurement of the image on
the screen or after photography can be used. Alternative apparatus based on image acquisition and processing
may be used to calculate the static contact angle.
5.3.2 Water for testing
The water used for the test shall be stored in the same environment as the test site for at least one day. De-
ionizedDeionized water shall be used, and it shall be verified that the electrical conductivity is less than 2 μS ·
-1
·cm before testing.
NOTE The water for testing can be Grade 2 of ISO 3696.
5.3.3 Sample
5.3.3.1 Requirements for the sample spectacle lens
The sample shall be a spectacle lens of minimum diameter 30 mm or square of minimum size 20 mm × 20 mm.
The valid testing area should be a circle of diameter not less than 30 mm or a square of minimum
size 20 mm × 20 mm. The spectacle lens to be tested should be unmounted.
The front surface of the spectacle lens to be tested shall have a radius of curvature of 80 mm or more. The lens
mustshall be stored in the test environment for at least one day.
When handling the sample spectacle lens to be tested, wear clean gloves and do not touch the test surface.
5.3.3.2 Preparation of the sample spectacle lens
The lenses shall be cleaned according to the manufacturer’s instructions prior to testing. No further wiping
shall be done after cleaning. If no such method is specified, the samples should be pretreated with the following
steps or similar steps with the same effect:
a) a) Lenses shall be cleaned thoroughly with a new cloth using a suitable agent, such as alcohol
([ethanol or isopropyl alcohol (propan-2-ol)),)], and then thoroughly clean each lens with deionized
water;.
b) b) wipe the lens surface with a cotton cloth until the lens is completely dry;.
c) c) In instances where the multi-layer coating contains an anti-static layer, there is less concern of
additional dust or dirt on the lens surface. (If the coating does not include such a layer, then static
accumulation of dirt should be addressed). The test lens surface shall be free of static electricity. If needed,
it shall be removed, e.g. by using a static eliminating blower or the like;.
d) d) Before testing, inspect the lens surface to ensure that there are no visible liquids and/or
contamination.
5.3.4 Procedure
5.3.4.1 Sample placement
a) a) Place the spectacle lens to be tested in the middle of the sample stand of the prepared test
equipment.
b) b) Adjust the specimen table of the test apparatus so that the vertex of the spectacle lens to be
tested can be seen on the screen of the optical measuring or viewing apparatus.
5.3.4.2 Test procedure
a) a) Suspend a 1 μl to 4 μl droplet of water at the end of the syringe needle. Bring the surface of the
mounted specimen into contact with the hanging droplet. Then move either the needle or the surface of
the specimen away to complete droplet transfer. Do not drop or squirt droplets on to the specimen
surface.
b) b) Take photographs or complete the measurement of contact angle between 5 s and 30 s after
the droplet transfer. Follow the instrument manufacturer's instructions concerning the maximum time, if
specified, between transferring the water droplet and measurement. If needed, a different time frame can
be agreed upon between the lens manufacturer and the customer of the lens, if needed.
c) c) Perform one measurement at the centre of the lens then at least at 2 other position
...
PROJET FINAL
Norme
internationale
ISO/TC 172/SC 7
Optique ophtalmique — Verres de
Secrétariat: DIN
lunettes finis non détourés —
Début de vote:
2026-04-07
Partie 4:
Spécifications et méthodes
Vote clos le:
2026-06-02
d'essai relatives aux propriétés
des traitements antireflet et
hydrophobes
Ophthalmic optics — Uncut finished spectacle lenses —
Part 4: Specifications and test methods for the properties of anti-
reflective coatings and hydrophobic coatings
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
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Numéro de référence
PROJET FINAL
Norme
internationale
ISO/TC 172/SC 7
Optique ophtalmique — Verres de
Secrétariat: DIN
lunettes finis non détourés —
Début de vote:
Partie 4: 2026-04-07
Spécifications et méthodes
Vote clos le:
2026-06-02
d'essai relatives aux propriétés
des traitements antireflet et
hydrophobes
Ophthalmic optics — Uncut finished spectacle lenses —
Part 4: Specifications and test methods for the properties of anti-
reflective coatings and hydrophobic coatings
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INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
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AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
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DOCUMENT PROTÉGÉ PAR COPYRIGHT
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© ISO 2026 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
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Publié en Suisse Numéro de référence
ii
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Exigences . 2
4.1 Exigences générales .2
4.2 Diamètre utilisable de la surface traitée .3
4.3 Facteur de réflexion lumineux et facteur de réflexion moyen .3
4.4 Hydrophobicité .3
4.5 Durabilité.3
5 Essais . 3
5.1 Généralités .3
5.2 Traitement antireflet .3
5.2.1 Méthode de détermination de la réflexion spectrale.3
5.2.2 Détermination des valeurs du facteur de réflexion spectrale .4
5.2.3 Détermination du facteur de réflexion lumineux .4
5.2.4 Détermination du facteur moyen de réflexion .4
5.2.5 Informations disponibles sur demande .5
5.3 Traitement hydrophobe .5
5.3.1 Appareillage de mesurage de l'angle de contact .5
5.3.2 Eau utilisée pour l'essai .5
5.3.3 Échantillon .5
5.3.4 Mode opératoire .6
5.4 Détermination de la durabilité .6
5.4.1 Équipement et consommables.6
5.4.2 Éprouvettes d'essai .6
5.4.3 Méthode d'essai: Combinaison de cycles environnementaux et de séquences de
frottement .6
5.4.4 Évaluation . .7
6 Référence au présent document . 7
Annexe A (informative) Signification de ρ et de ρ dans la description des verres traités
v M
antireflet. 8
Annexe B (normative) Séquence environnementale . 10
Annexe C (normative) Mode opératoire de séquence de frottement .12
Annexe D (normative) Évaluation de la qualité de la surface . 14
Annexe E (informative) Exemples de verres donnant des résultats satisfaisants ou non
satisfaisants à l’examen visuel .16
Annexe F (informative) Exemples de séquence environnementale . 17
Annexe G (informative) Exemples d'outil de frottement et ses composants . 19
Annexe H (informative) Exemple d'appareillage d'essai d'angle de contact .21
Bibliographie .23
iii
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l'ISO n'avait pas
reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/patents. L'ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de brevet.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 172, Optique et photonique, sous-comité
SC 7, Optique et instruments ophtalmiques, en collaboration avec le Comité européen de normalisation (CEN),
comité technique CEN/TC 170, Ophtalmique optique, conformément à l'Accord de coopération technique
entre l'ISO et le CEN (Accord de Vienne).
Cette troisième édition annule et remplace la deuxième édition (ISO 8980-4:2006), qui a fait l'objet d'une
révision technique.
Les principales modifications sont les suivantes:
— le titre a été mis à jour;
— le domaine d'application a été développé pour inclure les propriétés des traitements hydrophobes;
— le domaine d'application a été défini pour exclure les exigences et les méthodes d'essai figurant dans
d'autres normes de la série de normes ISO 8980;
— des références normatives, termes et définitions relatifs aux propriétés hydrophobes ont été ajoutés à
l'Article 2 et à l'Article 3;
— les méthodes d'essai relatives aux propriétés des traitements hydrophobes ont été ajoutées à l’Article 5
et aux Annexe C, Annexe D et Annexe E informatives et normatives.
Une liste de toutes les parties de la série ISO 8980 se trouve sur le site web de l'ISO.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l'adresse www.iso.org/fr/members.html.
iv
PROJET FINAL Norme internationale ISO/FDIS 8980-4:2026(fr)
Optique ophtalmique — Verres de lunettes finis non
détourés —
Partie 4:
Spécifications et méthodes d'essai relatives aux propriétés
des traitements antireflet et hydrophobes
1 Domaine d’application
Le présent document spécifie les exigences optiques et non optiques, ainsi que les méthodes d'essai, relatives
aux propriétés antireflet et hydrophobes des traitements appliqués sur les verres de lunettes.
Le présent document ne s'applique pas aux thématiques suivantes:
— les exigences et les méthodes d'essai intégrées dans d'autres normes de la série de normes ISO 8980;
— la couleur de la lumière réfléchie.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique. Pour
les références non datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
ISO 48, Caoutchouc vulcanisé ou thermoplastique — Détermination de la dureté (dureté comprise entre 10 DIDC
et 100 DIDC)
ISO 8980-1, Optique ophtalmique — Verres de lunettes finis non détourés — Partie 1: Spécifications pour les
verres unifocaux et multifocaux
ISO 8980-2, Optique ophtalmique — Verres de lunettes finis non détourés — Partie 2: Spécifications pour les
verres à variation de puissance
ISO 8980-3, Optique ophtalmique — Verres de lunettes finis non détourés — Partie 3: Spécifications relatives au
facteur de transmission et méthodes d'essai
ISO 13666:2019, Optique ophtalmique — Verres de lunettes — Vocabulaire
ISO 14889, Optique ophtalmique — Verres de lunettes — Exigences fondamentales relatives aux verres finis non
détourés
3 Termes et définitions
Pour les besoins du présent document, les termes et les définitions de l'ISO 13666 ainsi que les suivants
s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l'adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l'adresse https:// www .electropedia .org/
3.1
durabilité
capacité à résister dans le temps, en utilisation prévue, à la détérioration de ses
caractéristiques de réflexion
Note 1 à l'article: Les principaux facteurs contribuant à la détérioration d’un traitement antireflet sont le frottement,
la chaleur, le rayonnement ultraviolet et l’humidité.
Note 2 à l'article: La principale défaillance affectant la durabilité des propriétés antireflet est la perte d’adhérence. Les
exigences du présent document se rapportent donc à l’adhérence des traitements antireflet.
3.2
angle de contact statique
θ
angle, dans le plan vertical, entre la surface solide de l'éprouvette et la tangente à la surface d'une gouttelette
de liquide reposant sur cette surface, à l'interface entre l'air, le liquide et le substrat, dans des conditions
atmosphériques normales
Note 1 à l'article: L'angle de contact statique est illustré à la Figure 1.
Légende
1 surface de la gouttelette de liquide
2 surface du verre
Figure 1 — Illustration d'un angle de contact
3.3
traitement hydrophobe
traitement sur le dessus de la surface du verre ou couches de traitement de surface ayant des propriétés
hydrofuges
Note 1 à l'article: Un certain nombre de noms commerciaux, tels que autonettoyant, hydrophobe, hydrofuge,
imperméable, sont appliqués à ce type de traitement.
Note 2 à l'article: Il est généralement considéré qu'une surface hydrophobe présente un angle de contact statique avec
l'eau supérieur ou égal à 90°.
Note 3 à l'article: Les traitements hydrophobes sont fréquemment utilisés pour conférer des propriétés anti-salissure,
c'est-à-dire pour faciliter le nettoyage
4 Exigences
4.1 Exigences générales
Les verres traités antireflet et les verres traités hydrophobes doivent être conformes aux exigences
générales des spécifications relatives aux verres de lunettes finis, fournies dans l'ISO 8980-1, l'ISO 8980-3
et l'ISO 14889. Le présent document s'applique aux verres qui sont traités antireflet ou hydrophobes, ou une
combinaison des deux.
NOTE 1 Pour de plus amples informations concernant les propriétés des traitements antireflet, voir l'Annexe A.
NOTE 2 Il convient que la détérioration du traitement dans des conditions d'utilisation prévue n’entraîne pas de
variation significative des caractéristiques de réflexion d'un traitement antireflet.
4.2 Diamètre utilisable de la surface traitée
Le diamètre utilisable de la surface traitée des verres de lunettes finis non détourés doit être ≥ (d -4) mm, d
n n
étant le diamètre nominal du verre indiqué par le fabricant, en millimètres.
4.3 Facteur de réflexion lumineux et facteur de réflexion moyen
Le facteur de réflexion lumineux ρ et le facteur de réflexion moyen ρ d’un verre traité antireflet doivent
V M
être déterminés conformément à la méthode spécifiée en 5.2.2.
Si le fabricant spécifie des valeurs pour le facteur de réflexion lumineux et pour le facteur de réflexion
moyen, les valeurs mesurées ne doivent pas être supérieures de plus de 20 % aux valeurs spécifiées.
Lorsqu’il est déterminé de la manière décrite en 5.2.3, le facteur de réflexion lumineux ρ d’une surface
V
traitée antireflet, quelle qu’elle soit, doit être inférieur à 2,5 %.
4.4 Hydrophobicité
L'angle de contact statique de l'eau pour la surface avant d'un verre disposant d'un traitement hydrophobe
doit être déterminé par la méthode spécifiée en 5.3.
Pour les verres dont la propriété hydrophobe est revendiquée, l'angle de contact statique moyen de l'eau doit
être supérieur ou égal à 90°.
4.5 Durabilité
Dans les conditions décrites dans la méthode d’essai donnée en 5.4, cinq verres soumis à essai à la suite
doivent montrer une absence de perte significative d’adhérence au sens défini en 5.4.4.
Un produit satisfait aux exigences de durabilité du présent document si les cinq verres soumis à essai
respectent ce critère.
5 Essais
5.1 Généralités
Le présent article spécifie les méthodes d'essai de type des traitements antireflet et des traitements
hydrophobes des verres de lunettes. Au moins 24 h doivent s’écouler après traitement avant la réalisation de
tout essai de type. Les verres doivent être maintenus à une température comprise entre 20 °C et 26 °C.
5.2 Traitement antireflet
5.2.1 Méthode de détermination de la réflexion spectrale
5.2.1.1 Appareillage
Utiliser un spectrophotomètre à simple ou à double faisceau, ayant un angle d'incidence non supérieur
à 17° et une exactitude de mesure suffisante pour donner la valeur du facteur spectral de réflexion avec
une incertitude inférieure à 0,1 % à toutes les longueurs d'onde λ comprises entre 380 nm et 780 nm (un
traitement antireflet ayant un facteur de réflexion de 0,5 % peut, par exemple, donner une valeur mesurée
comprise entre 0,4 % et 0,6 %). L’incrément de longueur d'onde de mesure ne doit pas être supérieur à 5 nm.
La largeur de bande spectrale (largeur de bande à mi-hauteur) ne doit pas excéder 5 nm.
La pièce d’étalonnage doit avoir une courbure de surface correspondant à 0,50 D près à celle du verre de
lunettes à soumettre à essai. La surface arrière de cette éprouvette doit être conçue de manière à minimiser
les reflets indésirables (par exemple surface dépolie et peinte en noir mat). La pièce d’étalonnage doit avoir
un indice de réfraction connu n(λ) (incertitude Δn < 0,001) et ne doit pas avoir subi de traitement (qui
pourrait affecter les propriétés de réflexion de la surface). La surface doit être nettoyée.
5.2.1.2 Préparation des verres de lunettes
La surface du verre de lunettes à mesurer doit avoir un rayon de courbure supérieur à 80 mm. La surface
arrière de ce verre doit être conçue de sorte qu'aucun reflet ne perturbe les mesurages (par exemple, surface
dépolie peinte en noir mat). La surface doit être nettoyée.
5.2.1.3 Mesurages
Insérer la pièce d’étalonnage et étalonner le spectrophotomètre pour donner une valeur de 100 %. Insérer
ensuite le verre de lunettes. Le spectrophotomètre donnera la valeur du rapport de réflexion spectrale verre
de lunettes/pièce d’étalonnage, soit R (λ), en pourcentage. Cette technique permet de minimiser les erreurs
T
dues à la courbure de la surface.
Mesurer le rapport de réflexion spectrale verre de lunettes/pièce d’étalonnage sur la plage de 380 nm
à 780 nm. L'écart ne doit pas dépasser 5 nm.
5.2.2 Détermination des valeurs du facteur de réflexion spectrale
La valeur du facteur de réflexion spectrale de la surface de la pièce d’étalonnage R (λ) est calculée
C
théoriquement à partir de l'indice de réfraction, tel que fourni par l’Équation (1):
n 1
R (1)
C
n 1
où
R (λ) est le facteur de réflexion spectrale de la surface de la pièce d’étalonnage;
C
n(λ) est l'indice de réfraction
La valeur du facteur de réflexion spectrale de la surface des verres de lunettes est calculée en multipliant
la valeur de la réflexion spectrale de la pièce d’étalonnage par le rapport de réflexion spectrale verres de
lunettes/pièce d’étalonnage, tel que fourni par l’Équation 2:
ρ(λ) = R (λ) × R (λ) (2)
C T
où
ρ(λ) est la valeur du facteur de réflexion spectrale de la surface des verres de lunettes;
R (λ) est la valeur de la réflexion spectrale de la pièce d’étalonnage;
C
R (λ) est le rapport de réflexion spectrale verres de lunettes/pièce d’étalonnage.
T
5.2.3 Détermination du facteur de réflexion lumineux
Le facteur de réflexion lumineux ρ doit être calculé à l'aide des valeurs de la réflexion spectrale ρ(λ) ainsi
V
que de l’équation donnée dans l’ISO 13666:2019, 3.17.16.
5.2.4 Détermination du facteur moyen de réflexion
Le facteur moyen de réflexion ρ doit être calculé en utilisant les valeurs de la réflexion spectrale ρ(λ) et à
M
l'aide de l’équation donnée dans l’ISO 13666: 2019, 3.17.17.
5.2.5 Informations disponibles sur demande
Les valeurs du facteur de réflexion lumineux ρ et du facteur moyen de réflexion ρ ainsi que la courbe
V M
de réflexion spectrale doivent être disponibles sur demande pour une surface typique ayant un rayon de
courbure au moins égal à 80 mm.
5.3 Traitement hydrophobe
5.3.1 Appareillage de mesurage de l'angle de contact
Un équipement capable de mesurer l'angle de contact statique doit être utilisé. Cela peut être réalisé avec
une macrophotographie de la gouttelette, ou une projection de la gouttelette sur un écran. Un exemple
d'appareillage de projection est donné à l'Annexe H. Si un appareillage de projection est utilisé, un mesurage
direct de l'image sur l'écran ou après photographie peut être utilisé. Un autre appareillage basé sur
l'acquisition et le traitement de l'image peut être utilisé pour calculer l'angle de contact statique.
5.3.2 Eau utilisée pour l'essai
L'eau utilisée pour l'essai doit être maintenue dans le même environnement que le site d'essai pendant au
moins un jour. De l'eau déionisée doit être utilisée et il doit être vérifié que la conductivité électrique est
−1
inférieure à 2 μS·cm avant l'essai.
NOTE L'eau utilisée pour l'essai peut être de Qualité 2 de l'ISO 3696.
5.3.3 Échantillon
5.3.3.1 Exigences relatives au verre de lunettes échantillon
L'échantillon doit être un verre de lunettes d'un diamètre minimal de 30 mm ou un carré d'une taille
minimale de 20 mm × 20 mm. Il convient que la surface d'essai valide soit un cercle d'un diamètre d'au
moins 30 mm ou un carré d'une taille minimale de 20 mm × 20 mm. Il convient que le verre de lunettes à
soumettre à essai soit non monté.
La face avant du verre de lunettes à soumettre à essai doit avoir un rayon de courbure de 80 mm ou plus. Le
verre doit être conservé dans l'environnement d'essai pendant au moins un jour.
Lors de la manipulation du verre de lunettes éc
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