EN ISO 8980-4:2006

SLOVENSKI STANDARD
01-oktober-2006
Nadomešča:
SIST EN ISO 8980-4:2001
Očesna optika – Nebrušena zglajena stekla očal - 4. del: Specifikacije in preskusne
metode za protiodbojno prevleko (ISO 8980-4:2006)
Ophthalmic optics - Uncut finished spectacle lenses - Part 4: Specifications and test
methods for anti-reflective coatings (ISO 8980-4:2006)
Augenoptik - Rohkantige fertige Brillengläser - Teil 4: Anforderungen und Prüfverfahren
für reflexmindernde Vergütungen (ISO 8980-4:2006)
Optique ophtalmique - Verres de lunettes finis non détourés - Partie 4: Spécifications et
méthodes d'essai relatives aux traitements antireflet (ISO 8980-4:2006)
Ta slovenski standard je istoveten z: EN ISO 8980-4:2006
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 8980-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2006
ICS 11.040.70 Supersedes EN ISO 8980-4:2000
English Version
Ophthalmic optics - Uncut finished spectacle lenses - Part 4:
Specifications and test methods for anti-reflective coatings (ISO
8980-4:2006)
Optique ophtalmique - Verres de lunettes finis non détourés Augenoptik - Rohkantige fertige Brillengläser - Teil 4:
- Partie 4: Spécifications et méthodes d'essai relatives aux Anforderungen und Prüfverfahren für reflexmindernde
traitements antireflet (ISO 8980-4:2006) Vergütungen (ISO 8980-4:2006)
This European Standard was approved by CEN on 7 August 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8980-4:2006: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 8980-4:2006) has been prepared by Technical Committee ISO/TC 172
"Optics and optical instruments" 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 2007, and conflicting national
standards shall be withdrawn at the latest by February 2007.

This document supersedes EN ISO 8980-4:2000.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 8980-4:2006 has been approved by CEN as EN ISO 8980-4:2006 without any
modifications.
INTERNATIONAL ISO
STANDARD 8980-4
Second edition
2006-08-15
Ophthalmic optics — Uncut finished
spectacle lenses —
Part 4:
Specifications and test methods for
anti-reflective coatings
Optique ophtalmique — Verres de lunettes finis non détourés —
Partie 4: Spécifications et méthodes d'essai relatives aux traitements
antireflet
Reference number
ISO 8980-4:2006(E)
©
ISO 2006
ISO 8980-4:2006(E)
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ii © ISO 2006 – All rights reserved

ISO 8980-4:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Requirements . 2
4.1 General requirements. 2
4.2 Luminous and mean reflectances. 2
4.3 Usable diameter of coated area. 2
4.4 Durability . 2
5 Testing . 3
5.1 General. 3
5.2 Method of determination of reflectance . 3
5.3 Determination of spectral reflectance values .3
5.4 Determination of luminous reflectance . 4
5.5 Determination of mean reflectance. 4
5.6 Determination of durability . 4
6 Information to be made available on request . 5
7 Reference to this part of ISO 8980 . 5
Annex A (informative) Significance of ρ and ρ in the description of anti-reflective coated lenses. 6
V M
Annex B (normative) Environmental sequence . 7
Annex C (normative) Rubbing sequence procedure . 9
Annex D (normative) Evaluation conditions. 11
Annex E (informative) Examples of lenses passing and failing the visual evaluation . 13
Annex F (informative) Examples of environmental sequence. 14
Annex G (informative) Example of a rubbing tool and components. 16
Bibliography . 18

ISO 8980-4:2006(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 8980-4 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 7,
Ophthalmic optics and instruments.
This second edition cancels and replaces the first edition (ISO 8980-4:2000), which has been revised to
include non-optical specifications.
ISO 8980 consists of the following parts, under the general title Ophthalmic optics — Uncut finished spectacle
lenses:
⎯ Part 1: Specifications for single-vision and multifocal lenses
⎯ Part 2: Specifications for progressive power lenses
⎯ Part 3: Transmittance specifications and test methods
⎯ Part 4: Specifications and test methods for anti-reflective coatings
⎯ Part 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistant

iv © ISO 2006 – All rights reserved

INTERNATIONAL STANDARD ISO 8980-4:2006(E)

Ophthalmic optics — Uncut finished spectacle lenses —
Part 4:
Specifications and test methods for anti-reflective coatings
1 Scope
This part of ISO 8980 specifies optical and non optical requirements, including durability, and test methods for
anti-reflective coatings on spectacle lenses.
This part of ISO 8980 does not deal with the following topics:
⎯ transmittance and absorptance;
⎯ the colour of the reflected light.
2 Normative references
The following referenced documents are indispensable for the application 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 progressive
power lenses
ISO 8980-3, Ophthalmic optics — Uncut finished spectacle lenses — Part 3: Transmittance specifications and
test methods
ISO 13666, Ophthalmic optics — Spectacle lenses — Vocabulary
ISO 14889, Ophthalmic optics — Spectacle lenses — Fundamental requirements for uncut finished lenses
ISO 8980-4:2006(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13666 and the following apply.
3.1
durability
〈of anti-reflective coating〉 ability to resist deterioration of its reflectance characteristics, over time, in normal
use
NOTE 1 The major factors contributing to deterioration of an anti-reflective coating are rubbing, heat, UV radiation and
humidity.
NOTE 2 The main failure mechanism affecting the durability of anti-reflective coatings is a loss of adhesion. Therefore,
requirements of this part of ISO 8980 are related to anti-reflective coating adhesion.
4 Requirements
4.1 General requirements
Anti-reflective coated lenses shall comply with the general requirements concerning the finished spectacle
lens specifications in:
⎯ ISO 8980-1;
⎯ ISO 8980-2;
⎯ ISO 8980-3;
⎯ ISO 14889.
NOTE 1 For further information on the properties of anti-reflective coatings, see informative Annex A.
NOTE 2 The reflectance characteristics of an anti-reflective coating should not significantly change due to deterioration
of the coating in normal use.
4.2 Luminous and mean reflectances
The luminous reflectance ρ and the mean reflectance ρ of an anti-reflective coated lens shall be determined
V M
by the method specified in 5.2.
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 5.4, the luminous reflectance ρ of any anti-reflective coated lens surface
V
shall be less than 2,5 %.
4.3 Usable diameter of coated area
The usable diameter of the coated area for uncut finished spectacle lenses shall be W (d − 4) mm, where d
n n
is the nominal diameter of the lens, in millimetres, indicated by the manufacturer.
4.4 Durability
Under the conditions described in the test method given in 5.6, five consecutively tested lenses shall be free
of significant loss of adhesion as defined in 5.6.4.
A product meets the durability requirements of this part of ISO 8980 if all five lenses tested satisfy this criterion.
2 © ISO 2006 – All rights reserved

ISO 8980-4:2006(E)
5 Testing
5.1 General
This clause specifies type test methods for anti-reflective 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 Method of determination of reflectance
5.2.1 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 no reflection will interfere with the
measurement (e.g. both frosted and painted matt black). The calibration specimen shall be of known refractive
index n(λ) (uncertainty ∆n < 0,001) and have no coating (which could affect its surface reflective properties).
The surface shall be cleaned.
5.2.2 Spectacle lens preparation
The surface of the spectacle lens under test shall have a radius of curvature not less 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.
5.2.3 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), expressed as percentage. By using this technique, any error due to surface
T
curvature will be eliminated.
Measure the spectacle lens to calibration specimen spectral reflectance ratio over the range 380 nm to
780 nm, at least every 5 nm.
5.3 Determination of spectral reflectance values
The value of the calibration specimen surface spectral reflectance R (λ) is calculated theoretically from the
C
refractive index.
⎡⎤
n λ −1
()
R λ =
()⎢⎥
C
n λ +1
()
⎢⎥
⎣⎦
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:
ρ(λ) = R (λ) × R (λ)
C T
ISO 8980-4:2006(E)
5.4 Determination of luminous reflectance
Calculate the luminous reflectance ρ using both the spectral reflectance values ρ(λ) and the equation given
V
in ISO 13666.
5.5 Determination of mean reflectance
Calculate the
...