oSIST prEN ISO 12312-1:2021

Eye and face protection - Sunglasses and related eyewear - Part 1: Sunglasses for general use (ISO/DIS 12312-1:2021)

Augen- und Gesichtsschutz - Sonnenbrillen und ähnlicher Augenschutz - Teil 1: Sonnenbrillen für den allgemeinen Gebrauch (ISO/DIS 12312-1:2021)

Dieser Teil von ISO 12312 gilt für alle Sonnenbrillen ohne Korrektionswirkung (mit Nullgläsern) sowie Aufsteckscheiben für den allgemeinen Gebrauch einschließlich dem Autofahren und dem Gebrauch im Straßenverkehr, bestimmt für den Schutz gegen Sonnenstrahlung.
Anhang A gibt Informationen über die Verwendung von Sonnenschutzfiltern. Anforderungen an nicht montierte Sichtscheiben, die als Ersatz- oder Wechselfilter verwendet werden, sind in Anhang C gegeben.
Dieser Teil von ISO 12312 gilt nicht für ähnlichen Augenschutz, wie
a) Augenschutz gegen die Strahlung künstlicher Lichtquellen, z. B. von Solarien,
b) Augenschutzgeräte für bestimmte Sportarten (z. B. Skibrillen oder andere Arten),
c) Sonnenbrillen, die aus medizinischen Gründen zur Dämpfung von Sonnenstrahlung verschrieben wurden,
d) Produkte, die für den direkten Blick in die Sonne, z. B. für die Beobachtung einer partiellen oder ringförmigen Sonnenfinsternis, vorgesehen sind, und
e) Produkte für den betrieblichen Augenschutz.

Protection des yeux et du visage - Lunettes de soleil et articles de lunetterie associés - Partie 1: Lunettes de soleil pour usage général (ISO/DIS 12312-1:2021)

Varovanje oči in obraza - Sončna očala in sorodna oprema za varovanje oči - 1. del: Sončna očala za splošno uporabo (ISO/DIS 12312-1:2021)

General Information

• Status: Not Published
• Public Enquiry End Date: 14-Mar-2021
• ICS: 11.040.70 - Ophthalmic equipment
• ICS: 13.340.20 - Head protective equipment
• Technical Committee: OVP - Personal protecting equipment
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 28-Jan-2021
• Due Date: 17-Jun-2021
• Completion Date: 22-Mar-2021
• Directive: 2016/425 - Regulation (EU) 2016/425 of the European Parliament and of the Council of 9 March 2016 on personal protective equipment and repealing Council Directive 89/686/EEC
• Directive: 89/686/EEC - Council Directive 89/686/EEC of 21 December 1989 on the approximation of the laws of the Member States relating to personal protective equipment
• Mandate: M/571 - COMMISSION IMPLEMENTING DECISION of 19.11.2020 on a standardisation request to the European Committee for Standardization and the European Committee for Electrotechnical Standardization as regards personal protective equipment in support of Regulation (EU) 2016/425 of the European Parliament and of the Council
• Ref Project: prEN ISO 12312-1 - Eye and face protection - Sunglasses and related eyewear - Part 1: Sunglasses for general use (ISO/DIS 12312-1:2021)

RELATIONS

• Revised: SIST EN ISO 12312-1:2013/A1:2015 - Eye and face protection - Sunglasses and related eyewear - Part 1: Sunglasses for general use (ISO 12312-1:2013/Amd 1:2015)
• Effective Date: 01-Mar-2021
• Revised: SIST EN ISO 12312-1:2013 - Eye and face protection - Sunglasses and related eyewear - Part 1: Sunglasses for general use (ISO 12312-1:2013)
• Effective Date: 01-Mar-2021

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 12312-1:2021
01-marec-2021
Varovanje oči in obraza - Sončna očala in sorodna oprema za varovanje oči - 1.
del: Sončna očala za splošno uporabo (ISO/DIS 12312-1:2021)

Eye and face protection - Sunglasses and related eyewear - Part 1: Sunglasses for

general use (ISO/DIS 12312-1:2021)
Augen- und Gesichtsschutz - Sonnenbrillen und ähnlicher Augenschutz - Teil 1:
Sonnenbrillen für den allgemeinen Gebrauch (ISO/DIS 12312-1:2021)

Protection des yeux et du visage - Lunettes de soleil et articles de lunetterie associés -

Partie 1: Lunettes de soleil pour usage général (ISO/DIS 12312-1:2021)
Ta slovenski standard je istoveten z: prEN ISO 12312-1
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
13.340.20 Varovalna oprema za glavo Head protective equipment
oSIST prEN ISO 12312-1:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 12312-1:2021
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oSIST prEN ISO 12312-1:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12312-1
ISO/TC 94/SC 6 Secretariat: BSI
Voting begins on: Voting terminates on:
2021-01-11 2021-04-05
Eye and face protection — Sunglasses and related
eyewear —
Part 1:
Sunglasses for general use

Protection des yeux et du visage — Lunettes de soleil et articles de lunetterie associés —

Partie 1: Lunettes de soleil pour usage général
ICS: 13.340.20
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12312-1:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
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Phone: [phone]
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Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Construction and materials ....................................................................................................................................................................... 3

4.1 Construction .............................................................................................................................................................................................. 3

4.2 Filter material and surface quality ........................................................................................................................................ 3

4.3 Physiological compatibility .......................................................................................................................................................... 3

4.4 Headforms ................................................................................................................................................................................................... 4

5 Transmittance ......................................................................................................................................................................................................... 4

5.1 Test methods ............................................................................................................................................................................................. 4

5.2 Transmittance and filter categories ...................................................................................................................................... 4

5.3 General transmittance requirements .................................................................................................................................. 5

5.3.1 Uniformity of luminous transmittance ......................................................................................................... 5

5.3.2 Requirements for road use and driving ....................................................................................................... 6

5.3.3 Wide-angle scatter ......................................................................................................................................................... 6

5.3.4 Additional transmittance requirements for specific filter types ............................................ 6

5.3.5 Claimed transmittance properties .................................................................................................................... 8

6 Refractive power ................................................................................................................................................................................................... 9

6.1 Spherical and astigmatic power ............................................................................................................................................... 9

6.2 Spatial deviation .................................................................................................................................................................................... 9

6.3 Prism imbalance (relative prism error) ............................................................................................................................ 9

7 Robustness ...............................................................................................................................................................................................................10

7.1 Minimum robustness of filters ...............................................................................................................................................10

7.2 Frame deformation and retention of filters ................................................................................................................10

7.3 Impact resistance of sunglasses, strength level 1 (optional specification) ......................................11

7.4 Increased endurance of sunglasses (optional specification) .......................................................................11

7.5 Resistance to perspiration (optional specification) .............................................................................................11

7.6 Impact resistance of the filter, strength level 2 or 3 (optional specification) ................................12

8 Resistance to solar radiation ................................................................................................................................................................12

9 Resistance to ignition ...................................................................................................................................................................................13

10 Resistance to abrasion (optional specification) ...............................................................................................................13

11 Protective requirements ...........................................................................................................................................................................13

11.1 Coverage area ........................................................................................................................................................................................13

11.2 Temporal protective requirements.....................................................................................................................................13

12 Information and labelling ........................................................................................................................................................................14

12.1 Information to be supplied with each pair of sunglasses ...............................................................................14

12.2 Additional information .................................................................................................................................................................17

13 Selection of test samples ...........................................................................................................................................................................17

13.1 General ........................................................................................................................................................................................................17

13.2 Preparation and conditioning of test samples ..........................................................................................................17

Annex A (informative) Use of sunglass filters ..........................................................................................................................................21

Annex B (informative) Electro-optical filters filters ..........................................................................................................................23

Annex C (normative) Unmounted filters used as replacement or alternative filters .....................................26

Annex D (informative) Relationship between this European Standard and the essential

requirements of Regulation 2016/425 aimed to be covered ..............................................................................31

Bibliography .............................................................................................................................................................................................................................34

© ISO 2021 – All rights reserved iii
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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation 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 94 Personal safety – Personal protective

equipment, Subcommittee SC 6, Eye and face protection.

This second edition cancels and replaces the first edition (ISO 12312-1:2013), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— added a specification for the electro-optical filters;

— replaced the "local variations in refractive power" with the "spatial deviation";

— introduced the activation of photochromic lenses at 5 °C and 35 °C as optional information;

— extended the side protection to children's sunglasses mounting filter category 4 lenses.

A list of all parts in the ISO 12312 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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oSIST prEN ISO 12312-1:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 12312-1:2021(E)
Eye and face protection — Sunglasses and related
eyewear —
Part 1:
Sunglasses for general use
1 Scope

This part of ISO 12312 is applicable to all afocal (plano power) sunglasses and clip-ons for general use,

including road use and driving, intended for protection against solar radiation.

Information on the use of sunglass filters is given in Annex A. Requirements for unmounted filters used

as replacement or alternative filters are given in Annex C.
This part of ISO 12312 is not applicable to:

a) eyewear for protection against radiation from artificial light sources, such as those used in solaria;

b) eye protectors intended for specific sports (e.g. ski goggles or other types);

c) sunglasses that have been medically prescribed for attenuating solar radiation;

d) products intended for direct observation of the sun, such as for viewing a partial or annular solar

eclipse;
e) products intended for occupational eye protection.
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 4007:2018, Personal protective equipment — Eye and face protection — Vocabulary

ISO 8980-5:2005, Ophthalmic optics — Uncut finished spectacle lenses — Part 5: Minimum requirements

for spectacle lens surfaces claimed to be abrasion-resistant

ISO 12311:2013, Personal protective equipment — Test methods for sunglasses and related eyewear

ISO 18526-1:2020, Eye and face protection — Test methods — Part 1: Geometrical optical properties

ISO 18526-2:2020, Eye and face protection — Test methods — Part 2: Physical optical properties

ISO 18526-4:2020, Eye and face protection — Test methods — Part 4: Headforms

ISO 12870:2016, Ophthalmic optics — Spectacle frames — Requirements and test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4007 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
related eyewear

eyewear intended for protection in the same wavelength range as solar radiation but not necessarily

originated by natural sunlight
3.2
electro-optical sunglare filter
electro-optical sunglass filter

filter that varies, by electro-optical means, its luminous transmittance depending upon the irradiance

and wavelengths of the radiation to which it is exposed or under manual control

Note 1 to entry: The change may be under fully automatic or fully manual control, or under a combination, for

example where the luminous transmittance in the faded and darkened states is set manually, variation between

them automatically. The luminous transmittance of the filter therefore adjusts itself within certain limits to the

ambient radiant flux.
3.3
reaction time

‹electro-optical sunglare filter› response time of an electro-optical sunglare filter to darken from its faded

state towards its darkened state when activated or to fade from its darkened state towards its faded state

Note 1 to entry: The reaction time is the time taken for the filter to change luminous transmittance from τ t o

v 0
{τ - 0.9 × (τ - τ )} or from τ to {τ + 0.9 × (τ -τ ),
v 0 v 0 v 1 v 1 v 1 v 0 v 1
where
τ is the luminous transmittance of the lens or filter in the faded state;
v 0
τ is the luminous transmittance of the lens or filter in the darkened state.
v 1
3.4
absorption ratio

‹for an electro-optical sunglare filter› ratio of the luminous transmittance in the faded state to that in

the darkened state

Note 1 to entry: The attenuation ratio, AR, is calculated from the following formula:

v 0
AR=
v 1
where
τ is the luminous transmittance of the lens or filter in the faded state;
v 0
τ is the luminous transmittance of the lens or filter in the darkened state.
v 1
3.5
default mode

luminous transmittance state of an electro-optical sunglare filter when the power supply is

disconnected or malfunctions

Note 1 to entry: The power supply can be mains electricity, a battery or a photovoltaic cell.

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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
4 Construction and materials
4.1 Construction

When tested in accordance with ISO 12311:2013, Clause 6, areas of the sunglass, including the frame

and, if in a rimless or semi-rimless style, the edges of the filters that may come into contact with the

wearer during intended use shall be smooth and without sharp projections.

NOTE Manufacturers should restrict the range of screw sizes and threads used in sunglass frames to those

specified in ISO 11381:2016 Optics and optical instruments – Ophthalmic optics – Screw threads.

4.2 Filter material and surface quality

When tested in accordance with ISO 12311:2013, 6.2, except in a marginal area 5 mm wide, sunglass

filters shall have no material or machining defects within an area of 30 mm diameter centred on the

reference point that might impair vision, e.g. bubbles, scratches, inclusions, dull spots, pitting, mould

marks, notches, reinforced areas, specks, beads, water specks, pocking, gas inclusions, splintering,

cracks, polishing defects or undulations. If a 5 mm wide portion around the edge of the test sample

intrudes into this circular area, then this intrusion shall be excluded from testing.

4.3 Physiological compatibility

Sunglasses shall be designed manufactured and packaged in such way that, when used under normal

conditions they will not compromise the health or safety of the wearer. The risks posed by substances

leaking or evaporating from the sunglasses that can come into prolonged contact with the wearer, shall

be reduced by the manufacturer to within the limit of any applicable regulatory requirement.

Special attention shall be given to substances that are allergenic, carcinogenic, mutagenic or toxic to

reproduction.

NOTE 1 Excessive pressure due to a poor fit on the head, chemical irritation and allergy are known to produce

reactions. Rare or idiosyncratic reactions to any material known to occur and the individual wearer is well

advised to avoid those types of frame materials.

Substances recommended for cleaning, maintenance or disinfection shall be known to be unlikely to

have any adverse effect upon the wearer, when applied in accordance with the instructions given in the

information to be supplied by the manufacturer.

Manufacturers/suppliers shall perform an appropriate risk analysis on potentially harmful substances

contained in the sunglasses that, when the sunglasses are used under normal conditions, the health

(and safety) of the wearer shall not be compromised.

The following are examples of documents that represent the appropriate information.

a) Specification of the material(s)
b) Safety data sheets relating to the materials

c) Information relating to the suitability of the materials for use with food, in medical devices, or

other relevant applications

d) Information relating to toxicological, allergenic, carcinogenic, toxic to reproduction, or mutagenic

investigations on the materials.

NOTE 2 Attention is drawn to specific national regulations that restrict chemical substances, e.g. ISO 12870,

4.2.3 for nickel release test methods and requirements.
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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
4.4 Headforms

Unless the manufacturer specifies the headform(s) in accordance with ISO 18526-4:2020 that is/are

compatible with the sunglasses, the test methods where (a) headform(s) is/are required shall use the

headform 1-M in accordance with ISO 18526-4:2020 as the default.
5 Transmittance
5.1 Test methods

Transmittance values shall be determined in accordance with ISO 12311:2013, Clause 7. If the direction

of measurement is not specified, then it shall be measured normal to the surface of the test sample at

the geometrical centre.
5.2 Transmittance and filter categories

Sunglass filters for general use shall be assigned to one of five filter categories based on the luminous

transmittance at their reference point.

The range of the luminous transmittance of these five categories is given by the values in Table 1. An

overlap of the transmittance values shall be not more than ± 2 % (absolute) between adjacent categories

0, 1, 2 and 3. There is no overlap in transmittance values between categories 3 and 4.

The maximum deviation for the declared luminous transmittance value shall be ± 3 % absolute for

the transmittance values falling in categories 0 to 3 and ± 30 % relative to the stated value for the

transmittance values falling in category 4.

For gradient-tinted and/or mirrored filters, the maximum deviation for the declared luminous

transmittance value shall be double that for uniformly tinted lenses.

When describing the transmittance properties of photochromic filters, two categories for transmittance

values are generally used. These two values correspond to the faded state and to the darkened state of

the filter.

In the case of gradient-tinted filters, the transmittance value at the reference point shall be used to

characterize the luminous transmittance and the category of the filter.

For gradient-tinted filters, the overlap in luminous transmittance allowed between categories shall be

double that for uniformly tinted filters.

Table 1 also specifies the UV requirements for sunglass filters for general use and, when the filters are

claimed by the manufacturer to protect against IR radiation, the IR requirements.

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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
Table 1 — Transmittance for sunglass filters for general use
Consumer Technical Requirements
label label
Usage Filter Ultraviolet spectral range Visible spectral range Enhanced infra-
category red absorption
Maximum value of Maximum Range of luminous Maximum value
solar UV-B value of solar transmittance of solar IR
transmittance UV-A transmittance
transmittance
τ τ
SUVB SIR
380 nm to 780 nm
SUVA
280 nm to 780 nm to
315 nm to 2 000 nm
315 nm
380 nm
Very limited 0 0,05 τ τ τ > 80 % τ
v v v v
reduction of
sunglare
Limited pro- 1 0,05 τ τ 43 % < τ ≤ 80 % τ
v v v v
tection from
sunglare
Good protec- 2 1,0 % absolute or 0,5 τ 18 % < τ ≤ 43 % τ
v v v
tion against 0,05 τ , whichever
sunglare is greater
High protection 3 1,0 % absolute 0,5τ 8 % < τ ≤ 18 % τ
v v v
against sunglare
Very high pro- 4 1,0 % absolute 1,0 % abso- 3 % < τ ≤ 8 % τ
v v
tection against lute or 0,25 τ ,
extreme whichever is
sunglare, e.g. greater
at sea, over
snowfields, on
high mountain,
or in desert

NOTE The upper limit of UV-A at 380 nm is consistent with that used in ophthalmic optical standards and in ISO 20473,

Optics and photonics — Spectral bands.

Only applicable to sunglass filters recommended by the manufacturer as a protection against infrared radiation.

5.3 General transmittance requirements
5.3.1 Uniformity of luminous transmittance

The relative difference in the luminous transmittance value between any two points of the filter within

a circle 30 mm in diameter centred on the reference point shall not be greater than 15 % (relative to

the higher value), except for category 4 where it shall not be greater than 20 %. If a 5 mm wide portion

around the edge of the test sample intrudes into this circular area, then this intrusion shall be excluded

from testing

The geometric or boxed centre takes the place of the reference point if this is not known.

In the case of mounted gradient filters, this requirement shall be limited to sections parallel to the line

connecting the two reference points.

For mounted filters, the relative difference between the luminous transmittance value of the filters at

the reference point for the right and left eyes shall not exceed 20 % for gradient-tinted filters and 15%

for all other types (relative to the lighter filter).

Changes of luminous transmittance that are caused by thickness variations due to the design of the

filter are permitted. For verification, the test method in ISO 12311:2013, Annex L shall be used.

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oSIST prEN ISO 12312-1:2021
ISO/DIS 12312-1:2021(E)
5.3.2 Requirements for road use and driving
5.3.2.1 General

Filters suitable for road use and driving shall be of categories 0, 1, 2 or 3 and shall additionally meet the

following two requirements.

a) Spectral transmittance. The spectral transmittance of filters suitable for road use and driving for

wavelengths between 475 nm and 650 nm shall be not less than 0,2 τ .

b) Detection of signal lights. The relative visual attenuation quotient Q of filters of categories 0, 1, 2 and

3 suitable for road use and driving shall be not less than 0,80 for red signal light and not less than

0,60 for yellow, green and blue signal lights. The relative visual attenuation quotient for signal light

detection Q shall be calculated in accordance with ISO 12311:2013, 7.8 (spectral distribution of

signal
radiation emitted by incandescent lights).
5.3.2.2 Road use (including driving) in twilight or at night

Sunglass filters with a luminous transmittance of less than 75 % shall not be used in twilight or at

night for road use (including driving). In case of photochromic sunglass filters, this requirement applies

when tested in accordance with ISO 12311:2013, 7.11.
5.3.3 Wide-angle scatter

When tested in accordance with ISO 12311:2013, 7.9, at the reference point, the wide-angle scatter of

the filters in the condition as supplied by the manufacturer shall not exceed the value of 3 %.

5.3.4 Additional transmittance requirements for specific filter types
5.3.4.1 Photochromic filters

The categories of the photochromic filter shall be determined by its luminous transmittance in its faded

state, τ , and its luminous transmittance in its darkened state, τ , achieved after 15 min irradiation

v o v 1

according to ISO 12311:2013, 7.11. In both states, the requirements specified in 5.2 and, if applicable,

the requirements specified in 5.3.2, shall be met. For photochromic filters, τ /τ shall be ≥ 1,25.

v o v 1

Optionally, the luminous transmittance can be measured also at temperatures of 5 °C and 35 °C.

5.3.4.2 Polarizing filters

If the filters in the sunglasses are claimed to be polarizing, when tested in accordance with

ISO 12311:2013, 7.10.1, the filters shall be fitted in the frame so that their planes of transmission do

not deviate from the vertical, or
...