EN ISO 8980-3:1999

Ophthalmic optics - Uncut finished spectacle lenses - Part 3: Transmittance specifications and test methods (ISO 8980-3:1999)

This European standard determines the specifications and test methods for spectacle lenses transmission.

Augenoptik - Rohkantige fertige Brillengläser - Teil 3: Transmissionsanforderungen und Prüfverfahren (ISO 8980-3:1999)

Dieser Teil von ISO 8980 legt die Anforderungen für die Transmissionseigenschaften rohkantiger fertiger Brillengläser fest. Dieser Teil von ISO 8980 gilt nicht für: Brillengläser mit besonderen Transmissionseigenschaften oder Absorptionseigenschaften, die aus medizinischen Gründen verordnet werden; Produkte, für die besondere Normen hinsichtlich der Transmissionseigenschaften für persönliche Schutzausrüstungen gelten; Optische und geometrische Anforderungen an ungerandete Brillengläser sind in ISO 8980-1 und ISO 8980-2 festgelegt.

Optique ophtalmique - Verres de lunettes finis non détourés - Partie 3: Spécifications relatives au facteur de transmission et méthodes d'essai (ISO 8980-3:1999)

Očesna optika - Nebrušena zglajena stekla očal - 3. del Specifikacija za transmisijo in preskusne metode (ISO 8980-3:1999)

General Information

• Status: Withdrawn
• Publication Date: 31-May-1999
• Withdrawal Date: 30-Nov-2004
• ICS: 11.040.70 - Ophthalmic equipment
• Technical Committee: CEN/TC 170 - Ophthalmic optics
• Drafting Committee: CEN/TC 170 - Ophthalmic optics
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 01-Dec-2004
• Completion Date: 01-Dec-2004
• Ref Project: SIST EN ISO 8980-3:2000 - Ophthalmic optics - Uncut finished spectacle lenses - Part 3: Transmittance specifications and test methods (ISO 8980-3:1999)

Relations

• Replaced By: EN ISO 8980-3:2004 - Ophthalmic optics - Uncut finished spectacle lenses - Part 3: Transmittance specifications and test methods (ISO 8980-3:2004)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 8980-3:2000
01-julij-2000
2þHVQDRSWLND1HEUXãHQD]JODMHQDVWHNODRþDOGHO6SHFLILNDFLMD]DWUDQVPLVLMR
LQSUHVNXVQHPHWRGH,62
Ophthalmic optics - Uncut finished spectacle lenses - Part 3: Transmittance
specifications and test methods (ISO 8980-3:1999)
Augenoptik - Rohkantige fertige Brillengläser - Teil 3: Transmissionsanforderungen und
Prüfverfahren (ISO 8980-3:1999)
Optique ophtalmique - Verres de lunettes finis non détourés - Partie 3: Spécifications
relatives au facteur de transmission et méthodes d'essai (ISO 8980-3:1999)
Ta slovenski standard je istoveten z: EN ISO 8980-3:1999
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 8980-3:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8980-3:2000

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SIST EN ISO 8980-3:2000

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SIST EN ISO 8980-3:2000

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SIST EN ISO 8980-3:2000

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SIST EN ISO 8980-3:2000

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SIST EN ISO 8980-3:2000
INTERNATIONAL ISO
STANDARD 8980-3
First edition
1999-06-01
Ophthalmic optics — Uncut finished
spectacle lenses —
Part 3:
Transmittance specifications and test methods
Optique ophtalmique — Verres de lunettes finis non détourés —
Partie 3: Spécifications relatives au facteur de transmission et méthodes
d'essai
A
Reference number
ISO 8980-3:1999(E)

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SIST EN ISO 8980-3:2000
ISO 8980-3:1999(E)
Contents
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Classification.2
5 Requirements.2
6 Testing .4
7 Information to be supplied.8
Annex A (normative) Spectral weighting functions for calculating relative visual attenuation quotients .9
Annex B (normative) Calculation of solar UV transmittance values.11
Annex C (informative) Spectral radiation risks .13
Bibliography.14
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
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SIST EN ISO 8980-3:2000
© ISO
ISO 8980-3:1999(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 3.
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.
International Standard ISO 8980-3 was prepared by ISO/TC 172, Optics and optical instruments, Subcommittee
SC 7, Ophthalmic optics and instruments.
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-reflection coatings
Annexes A and B form a normative part of this part of ISO 8980. Annex C is for information only.
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SIST EN ISO 8980-3:2000

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SIST EN ISO 8980-3:2000
INTERNATIONAL STANDARD  © ISO ISO 8980-3:1999(E)
Ophthalmic optics — Uncut finished spectacle lenses —
Part 3:
Transmittance specifications and test methods
1 Scope
This part of ISO 8980 specifies requirements for the transmittance properties of uncut finished spectacle lenses.
This part of ISO 8980 is not applicable to:
 spectacle lenses having particular transmittance or absorption characteristics prescribed for medical reasons;
 products where specific personal protective equipment transmittance standards apply.
NOTE Optical and geometric requirements for uncut finished spectacle lenses are specified in ISO 8980-1 and
ISO 8980-2.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 8980. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 8980 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 13666:1998, Ophthalmic optics — Spectacle lenses — Vocabulary.
ISO 14889:1997, Ophthalmic optics — Fundamental requirements for uncut finished spectacle lenses.
1)
ISO/CIE 10526:1991, CIE standard colorimetric illuminants.
ISO/CIE 10527:1991, CIE standard colorimetric observers.
3 Terms and definitions
For the purposes of this part of ISO 8980, the terms and definitions given in ISO 13666 apply.

1) International Commission on Illumination, Kegelgasse 27, A-1030 Vienna.
1

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SIST EN ISO 8980-3:2000
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ISO 8980-3:1999(E)
4 Classification
Spectacle lenses are classified with respect to transmittance as follows:
a) clear spectacle lenses;
b) uniformly tinted spectacle lenses;
c) gradient-tinted spectacle lenses;
d) photochromic spectacle lenses;
e) polarizing spectacle lenses.
NOTE Two or more of the above classifications may be combined.
5 Requirements
5.1 General
The requirements shall apply at a temperature of 23 °C – 5 °C, and shall apply to the design reference point, unless
specified otherwise. Measurements shall be made with a test beam having a minimum width of 5 mm in any
direction.
5.2 General transmittance requirements
The general transmittance requirements specified in ISO 14889 shall apply.
Spectacle lenses shall be attributed to one of five luminous transmittance categories as specified in Table 1, and
shall be tested as described in clause 6.
NOTE Table 1 also includes the UV requirements for spectacle lenses, but those spectacle lenses of category 0 for which
no specific claim is made as to UV transmittance performance are excluded from the UV requirements of Table 1.
Table 1 — Categories for luminous transmittance and the related permissible transmittance
in the ultraviolet solar spectral range
Categories Visible spectral range Ultraviolet spectral range
Range of luminous Maximum value of solar Maximum value of solar
transmittance UV-A transmittance UV-B transmittance
t t t
v SUVA SUVB
from over to over 315 nm to 380 nm over 280 nm to 315 nm
UV-A UV-B
% %
0 80,0 100
t
v
1
43,0 80,0
t
v
2 18,0 43,0
0,125 t
v
3 8,0 18,0
0,5 t
v
4 3,0 8,0 1,0 % absolute
NOTE 1 Photochromic spectacle lenses are usually attributed to two categories, corresponding respectively
to the faded state and to the darkened state.
NOTE 2 The UV requirements of photochromic spectacle lenses in the darkened state may be checked in
the faded state, if the UV requirements for the darkened state are met in the faded state.
NOTE 3 It is recommended that uniform or gradient tints should be ordered by reference to a manufacturer’s
identification code, name or reference number.
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SIST EN ISO 8980-3:2000
© ISO
ISO 8980-3:1999(E)
For categories 0, 1, 2 and 3, the luminous transmittance t of the spectacle lens at the design reference point shall
v
not lie outside the limits of the stated category by more than 2 % absolute.
For category 4, the luminous transmittancet of the spectacle lens at the design reference point shall not lie outside
v
the limits of that category by more than 20 % relative to the stated luminous transmittance.
5.3 Requirements for driving
Spectacle lenses to be used by vehicle drivers shall conform to the specific requirements for transmittance specified
in ISO 14889.
5.4 Transmittance requirements for special types of spectacle lenses
5.4.1 Photochromic spectacle lenses
5.4.1.1 General
When tested by the methods described in 6.5, the luminous transmittance values of a photochromic spectacle
lens in its faded and in its darkened states shall be used to identify the appropriate categories in accordance with
Table 1.
5.4.1.2 Photochromic response
When tested by the methods described in 6.5.3.1 to 6.5.3.3, the ratio of the luminous transmittance of a
photochromic specimen (see 6.5.1) in its faded state t ()0 and, after 15 min irradiation, in its darkened
v
statet (15)shall be at least 1,25. That is:
v
t ()0
v
˜ 1,25 (1)
t (15)
v
5.4.1.3 Photochromic response at various temperatures (optional)
If photochromic temperature sensitivity is stated, it shall be determined by measuring the luminous transmittance of
the specimen (see 6.5.1) in the darkened statet (15) using the procedure described in 6.5.3.6 at 5 °C, 23 °C and
v
35 °C.
NOTE The manufacturer may use additional temperatures, provided this information is given.
5.4.1.4 Photochromic response at moderate light levels (optional)
If the photochromic response at moderate light levels is stated, it shall be determined by measuring the luminous
transmittance of the specimen (see 6.5.1) in the darkened statet (15) using the procedure described in 6.5.3.4
v
after exposure to the illumination specified in 6.5.2.1 attenuated to an intensity of 30 %.
5.4.2 Polarizing spectacle lenses
When tested by the method described in 6.6, the ratio of the luminous transmittance values of a polarizing spectacle
lens measured parallel and perpendicular to the plane of polarization shall be greater than 8:1 for categories 2, 3, 4
and shall be greater than 4:1 for category 1.
If there is a marking on the spectacle lens indicating the plane of polarization, then the actual plane of polarization
shall not deviate from this marking by more than – 3°.
5.4.3 Gradient-tinted spectacle lenses
The stated category for gradient-tinted spectacle lenses shall be determined at the design reference point of the
spectacle lens.
NOTE It is recommended that gradient tints be ordered by reference to a manufacturer’s identification code, name or
reference number.
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SIST EN ISO 8980-3:2000
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ISO 8980-3:1999(E)
5.5 Resistance to radiation
Following irradiation as specified in 6.7, the relative change in the luminous transmittancet at the design
v
reference point (for photochromic lenses: in the faded state when tested by the methods described in 6.5.3.1 and
6.5.3.2) shall be less than
– 10 % for spectacle lenses of categories 0 and 1 and
– 20 % for spectacle lenses of categories 2, 3 and 4.
t ()0
v
For photochromic spectacle lenses, the photochromic response following irradiation additionally shall be
t (15)
v
maintained at ˜ 1,25 (regardless of the category).
6 Testing
6.1 General
This clause specifies type-test methods for transmittance properties of spectacle lenses.
NOTE For purposes of quality control, etc., alternative test methods may be used if shown to be equivalent.
6.2 Spectral transmittance
The uncertainties of the test methods determining transmittance values shall be
2 % absolute, for transmittance > 20 %;
10 % relative, for transmittance ¶ 20 %.
These measurement uncertainties shall be based on a confidence level of 95 %.
6.3 Luminous transmittance and relative visual attenuation quotient
The spectral distribution of standard illuminant D 65 as specified in ISO/CIE 10526 and the luminous efficiency of
the average human eye for daylight vision as specified in ISO/CIE 10527 shall be used to determine the luminous
transmittancet . When calculating the luminous transmittancet from the spectral transmittancet()l , the step
v v
width shall not exceed 10 nm.
NOTE 1 The product of the spectral distribution of radiation of the standard illuminant D 65 and the luminous efficiency of the
average human eye for daylight vision is given in annex A. Linear interpolation of these values for steps smaller than 10 nm is
permissible.
When calculating the relative visual attenuation quotient Q for signal lights from the spectral transmittance t()l , the
step width shall not exceed 10 nm.
NOTE 2 The products of the spectral distribution of radiation of the signal lights and of standard illuminant D 65 and the
spectral luminous efficiency function for daylight vision are given in annex A. Linear interpolation of these values for steps
smaller than 10 nm is permissible. Requirements for the relative visual attenuation quotient Q for signal lights are given in
ISO 14889.
6.4 Ultraviolet transmittance
The ultraviolet transmittance in the spectral range from 280 nm to 380 nm of the uncut finished spectacle lens shall
be determined using a spectrophotometer.
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SIST EN ISO 8980-3:2000
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ISO 8980-3:1999(E)
The spectrophotometer shall:
a) operate over the wavelength range from 280 nm to 380 nm;
b) have a spectral bandwidth (full width at half-maximum, FWHM) not exceeding 5 nm;
c) be capable of measuring spectral data at wavelength intervals not greater than 5 nm;
d) be capable of determining spectral transmittance to within 2,0 % absolute for transmittance > 20 %, and to
within 10 % relative for transmittance ¶ 20 %.
When calculating bioactinically-weighted solar UV transmittance values t from 280 nm to 315 nm and t
SUVB SUVA
from 315 nm to 380 nm, the step width shall not exceed 5 nm and shall be equal to the spectral bandwidth used for
the spectral transmittance measurements.
NOTE The spectral functions for the calculation of the bioactinically-weighted solar ultraviolet transmittance values t
SUVA
and t defined in ISO 13666 are given in annex B. Linear interpolation of these values for steps smaller than 5 nm is
SUVB
permissible.
6.5 Transmittance properties of photochromic spectacle lenses and photochromic specimens
6.5.1 Test specimens
The test specimens shall be plano spectacle lenses, normally with a reference thickness of 2,0 mm – 0,1 mm. If a
thickness outside this range is used, the thickness shall be stated. After having undergone careful cleaning, each
specimen shall be conditioned as described in 6.5.3.1.
NOTE The base curve is not specified, but should be recorded.
6.5.2 Apparatus
6.5.2.1  Irradiation source, used to darken photochromic spectacle lens.
The irradiation source (solar simulator) shall approximate as closely as practical the spectral power distribution
of solar radiation defined as Air Mass (AM) m = 2 (see [3] or [11]) at an illuminance of 50 000 lx – 3 000 lx and a
2 2
UV-A Irradiance between 6,5 W/m and 11 W/m spectrally integrated over the 315 nm to 380 nm UV range, at the
specimen’s position. The intensity of the solar simulator shall be monitored to correct for drifts in the output of the
source.
See annex C for details of risks associated with solar radiation.
NOTE 1  Care should be taken to ensure the light from the source does not interfere with the transmittance measurements.
NOTE 2  To attenuate the intensity of th
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