kSIST FprEN ISO 18527-1:2020

Eye and face protection for sports use - Part 1: Requirements for downhill skiing and snowboarding goggles (ISO/FDIS 18527-1:2020)

This International Standard applies to all afocal (plano power) goggles, intended for eye protection against
hazards including ultraviolet and visible solar radiation, rain, snow and wind, during downhill skiing, snowboarding
and other activities with similar hazards and no greater risks.
It deals with materials, construction, optical properties, testing, labelling and marking.
Requirements for the marking of goggles and for information to be supplied by the manufacturer are also
specified.
Information on the selection and use of ski and snow-boarding goggles is given in Annex A.
This International Standard does not apply to:
a) eyewear for protection when operating or travelling on a motorized vehicle;
b) eyewear for protection against radiation from artificial light sources, such as those used in
solaria;
c) eyewear for direct observation of the sun;
d) eye protectors intended for sports with unrelated hazards and risks.

Augen- und Gesichtsschutz für sportliche Anwendungen - Teil 1: Anforderungen an Abfahrtski- und Snowboardbrillen (ISO/FDIS 18527-1:2020)

Dieses Dokument gilt für alle Korbbrillen mit Plan-Sichtscheiben, die dafür vorgesehen sind, die Augen beim Abfahrtskifahren, Snowboarden und anderen ähnlichen sportlichen Aktivitäten vor Gefährdungen einschließlich ultravioletter und sichtbarer Sonnenstrahlung, Regen, Schnee und Wind zu schützen.
Dieses Dokument gilt für Abfahrtski- und Snowboardbrillen, die mit einem Einsatz zum Tragen von Korrektionssichtscheiben ausgestattet sind.
Es legt die Anforderungen und Prüfungen für Werkstoffe, Funktionstauglichkeit, Kennzeichnung von Korbbrillen und die vom Hersteller bereitzustellenden Informationen fest.
Anhang A enthält Informationen zur Auswahl und Verwendung von Abfahrtski- und Snowboard-Korbbrillen.
Dieses Dokument gilt nicht für
a) Augenschutzgeräte zum Schutz beim Betrieb eines motorisierten Fahrzeugs oder bei der Fahrt mit einem solchen,
b) Augenschutzgeräte zum Schutz gegen optische Strahlung aus künstlichen Quellen, wie sie z. B. in Solarien zum Einsatz kommt,
c) Augenschutzgeräte für die direkte Beobachtung der Sonne, und
d) Augenschutzgeräte, die für Sportarten mit nicht verwandten Gefährdungen und Risiken vorgesehen sind.

Protection des yeux et du visage à usage sportif - Partie 1: Exigences relatives aux lunettes de ski alpin et de surf des neiges (ISO/FDIS 18527-1:2020)

Ščitniki za oči in obraz za uporabo pri športu - 1. del: Zahteve za smučarska očala za smuk in deskanje na snegu (ISO/FDIS 18527-1:2020)

General Information

• Status: Not Published
• Public Enquiry End Date: 19-Jul-2018
• ICS: 13.340.20 - Head protective equipment
• ICS: 97.220.20 - Winter sports equipment
• Technical Committee: OVP - Personal protecting equipment
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 01-Oct-2020
• Due Date: 19-Nov-2020
• Completion Date: 13-Oct-2020
• 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
• Ref Project: FprEN ISO 18527-1 - Eye and face protection for sports use - Part 1: Requirements for downhill skiing and snowboarding goggles (ISO/FDIS 18527-1:2020)

RELATIONS

• Revised: SIST EN 174:2001 - Personal eye-protection - Ski goggles for downhill skiing
• Effective Date: 15-Apr-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 18527-1:2018
01-julij-2018

âþLWQLNL]DRþLLQREUD]]DXSRUDERSULãSRUWXGHO=DKWHYH]DVPXþDUVNDRþDOD

]DVPXNLQGHVNDQMHQDVQHJX,62',6

Eye and face protectors for sports use - Part 1 - Requirements for downhill skiing and

snow-boarding goggles (ISO/DIS 18527-1:2018)
Augen- und Gesichtsschutz für sportliche Anwendungen - Teil 1: Anforderungen an
Abfahrtski- und Snowboardbrillen (ISO/DIS 18527-1:2018)

Protection des yeux et du visage à usage sportif - Partie 1: Exigences relatives aux

lunettes de ski alpin et de surf des neiges (ISO/DIS 18527-1:2018)
Ta slovenski standard je istoveten z: prEN ISO 18527-1
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
97.220.20 Oprema za zimske športe Winter sports equipment
oSIST prEN ISO 18527-1:2018 en

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

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oSIST prEN ISO 18527-1:2018
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oSIST prEN ISO 18527-1:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 18527-1
ISO/TC 94/SC 6 Secretariat: BSI
Voting begins on: Voting terminates on:
2018-05-23 2018-08-15
Eye and face protection for sports use —
Part 1:
Requirements for downhill skiing and snow-boarding
goggles
Protection des yeux et du visage à usage sportif —
Partie 1: Exigences relatives aux lunettes de ski alpin et de surf des neiges
ICS: 97.220.20; 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 18527-1:2018(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 2018
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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 2018 – All rights reserved
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 General requirements for goggles ...................................................................................................................................................... 2

4.1 Headforms ................................................................................................................................................................................................... 2

4.2 Construction .............................................................................................................................................................................................. 2

4.3 Lens material and surface quality .......................................................................................................................................... 2

4.4 Physiological compatibility .......................................................................................................................................................... 2

4.5 Retention by headband and harnesses (sit and fit) ................................................................................................ 3

5 Transmittance ......................................................................................................................................................................................................... 3

5.1 Test methods ............................................................................................................................................................................................. 3

5.2 Transmittance categories .............................................................................................................................................................. 3

5.3 General transmittance requirements .................................................................................................................................. 4

5.3.1 Uniformity of luminous transmittance and transmittance matching ................................ 4

5.3.2 Ultraviolet transmittance of the frame or housing ............................................................................. 5

5.4 Special transmittance requirements .................................................................................................................................... 5

5.4.1 Photochromic lenses .................................................................................................................................................... 5

5.4.2 Polarizing lenses .............................................................................................................................................................. 5

5.4.3 Gradient-tinted lenses ................................................................................................................................................. 5

5.4.4 Claimed solar transmittance properties (optional)........................................................................... 6

5.5 Scattering of light .................................................................................................................................................................................. 7

6 Refractive power ................................................................................................................................................................................................... 7

6.1 General ........................................................................................................................................................................................................... 7

6.2 Spherical and cylindrical power .............................................................................................................................................. 7

6.3 Spatial deviation .................................................................................................................................................................................... 7

6.4 Prism imbalance .................................................................................................................................................................................... 8

7 Mechanical testing .............................................................................................................................................................................................. 8

7.1 Temperature range .............................................................................................................................................................................. 8

7.1.1 Basic requirement .......................................................................................................................................................... 8

7.2 Mechanical strength ........................................................................................................................................................................... 8

8 Resistance to solar radiation ................................................................................................................................................................... 9

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

10 Protection against water and snow ................................................................................................................................................... 9

11 Field of view............................................................................................................................................................................................................... 9

12 Minimum area to be protected from ultraviolet radiation ....................................................................................10

12.1 Assessment of frontal protection .........................................................................................................................................10

12.2 Assessment of lateral protection ..........................................................................................................................................10

13 Optional requirements ...............................................................................................................................................................................11

13.1 Extended low temperature range ........................................................................................................................................11

13.2 Resistance to fogging ......................................................................................................................................................................11

13.3 Resistance to abrasion ...................................................................................................................................................................11

14 Information to be supplied by the manufacturer and labelling .......................................................................12

14.1 Complete goggles ...............................................................................................................................................................................12

14.1.1 Mandatory markings on goggles .....................................................................................................................12

14.1.2 Information to be supplied by the manufacturer with each goggle .................................12

14.1.3 Additional information to be available from the manufacturer ...........................................15

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oSIST prEN ISO 18527-1:2018
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15 Selection of test samples ...........................................................................................................................................................................15

15.1 General ........................................................................................................................................................................................................15

15.2 Preparation and conditioning of test samples ..........................................................................................................15

Annex A (informative) Selection and use of ski and snowboarding goggles ............................................................18

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

requirements of Regulation 2016/425 aimed to be covered ..............................................................................21

Bibliography .............................................................................................................................................................................................................................23

iv © ISO 2018 – All rights reserved
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(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 on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.

The committee responsible for this document is ISO/TC 94, Personal safety - Protective clothing and

equipment, Subcommittee SC 6, Eye and face protection.
A list of the parts of ISO 18527 can be found on the ISO website.
© ISO 2018 – All rights reserved v
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
Introduction

This family of documents was developed in response to the worldwide stakeholder's demand for

minimum requirements and test methods for eye and face protectors traded internationally. ISO 4007

gives the terms and definitions for all the various product types. The test methods are in the ISO 18526-

series, while the requirements for occupational eye and face protectors are in the ISO 16321- series. Eye

protection for specific sports is mostly dealt with by the ISO 18527- series. A guidance document for the

selection, use and maintenance of eye and face protectors is in preparation.
vi © ISO 2018 – All rights reserved
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oSIST prEN ISO 18527-1:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 18527-1:2018(E)
Eye and face protection for sports use —
Part 1:
Requirements for downhill skiing and snow-boarding
goggles
1 Scope

This document applies to all afocal (plano power) goggles, intended for eye protection against

hazards including ultraviolet and visible solar radiation, rain, snow and wind, during downhill skiing,

snowboarding and other similar activities. It deals with materials, construction, optical properties and

testing.

Requirements for the labelling and marking of goggles and for information to be supplied by the

manufacturer are also specified. Information on the Selection and use of downhill skiing and

snowboarding goggles is given in Annex A.
This document does not apply to:

a) eye protectors for protection when operating or travelling on a motorized vehicle;

b) eye protectors for protection against artificial optical radiation, such as those used in solaria;

c) eye protectors for direct observation of the sun;
d) eye protectors intended for sports with unrelated hazards and risks.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. 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 8980-4:2006, Ophthalmic optics — Uncut finished spectacle lenses — Part 4: Specifications and test

methods for anti-reflective coatings

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

for spectacle lens surfaces claimed to be abrasion-resistant
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants

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

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

ISO 18526-3, Eye and face protection – Test methods – Part 3: Physical and mechanical properties

1) Under preparation (Stage at the time of publication ISO/DIS 18526-1)
2) Under preparation (Stage at the time of publication ISO/DIS 18526-2)
3) Under preparation (Stage at the time of publication ISO/DIS 18526-3)
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
ISO 18526-4, Eye and face protection – Test methods – Part 4: Headforms
3 Terms and definitions

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

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp

For the purposes of this document, “goggle” or “goggles” shall be taken to mean goggles for downhill

skiing, snowboarding and other similar activities.
4 General requirements for goggles
4.1 Headforms

Unless the manufacturer defines the applicable headforms according to ISO 18526-4 to be compatible

with the goggle, the test methods where headforms are required shall use the headform 1-M according

to ISO 18526-4 as the default.
4.2 Construction

Areas of the goggles that may, during intended use, come into contact with the wearer shall be smooth,

without sharp protuberances that may cause discomfort or injury to the wearer. This shall be tested by

physical inspection in accordance with ISO 18526-3:6.1.
4.3 Lens material and surface quality

In a circular area 30 mm diameter centred on the reference point but excluding a marginal area 5 mm

wide around the edge of the lens if this overlaps with the circular area, filters shall have no material or

machining defects that may 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. Outside this zone, small isolated material and/or surface defects

may be acceptable. This shall be tested by visual assessment in accordance with ISO 18526-3, 6.6.

4.4 Physiological compatibility

Goggles shall be designed and manufactured in such a way that, when used under the conditions and

for the purposes intended, they will not compromise the health or safety of the wearer. The risks

posed by substances leaking or evaporating from the goggle that can come into prolonged contact

with the wearer, shall be reduced by the manufacturer to within the limits of any existing 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 face, chemical irritation or allergy is known to produce

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

advised to avoid those types of frame materials.

NOTE 2 Specific national regulations with regard to restriction of certain chemical substances should be

observed, for example release of nickel in Europe.
4) Under preparation (Stage at the time of publication ISO/DIS 18526-4)
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
4.5 Retention by headband and harnesses (sit and fit)

Goggles shall sit in the intended position during normal use and shall adapt to the contours of the face..

The head strap shall be designed to be flexible or adjustable and sit securely on the back of the head or a

helmet. The head strap assembly shall not cause any discomfort nor exhibit any insecurity when tested

in accordance with ISO 18526-3, 6.5.
5 Transmittance
5.1 Test methods

Transmittance values shall be determined in accordance with ISO 18526-2:, Clauses 6 to 11 as

appropriate. Luminous transmittance shall be calculated using CIE standard illuminant D65

(ISO 4007:2018, term 3.9.1.32).
5.2 Transmittance categories

Depending upon their luminous transmittance at their reference point and at (+5 ± 2) °C in the case

of lenses with temperature sensitive transmittance, lenses for downhill skiing and snowboarding use

shall be attributed to one of the five tint categories in Table 1.

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

There are only three descriptive groups for use by consumers as shown in Table 8. An overlap of the

transmittance values shall be not more than ± 2 % (absolute) between the categories 0, 1, 2 and 3.

There is no overlap in transmittance values between categories 3 and 4.

If the supplier declares a luminous transmittance value, the maximum deviation for this 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 tint category 4.

When describing the transmittance properties of a lens with changeable tint, e.g. photochromic, two

categories for transmittance values are generally used. These two values correspond to the highest and

lowest transmittance states of the lens.

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

characterize the luminous transmittance and the tint category.

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

double that for uniformly tinted lenses.

Table 1 also specifies also the UV requirements for these lenses. If the lenses are claimed by the

manufacturer to protect against IR radiation, the IR requirements in Table 1 apply.

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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
Table 1 — Transmittance requirements for downhill skiing and snowboarding lenses
Visible spectral Optional infrared
Wavelength range from 280 nm to 400 nm
range spectral range
Maximum Maximum Mean 380 to 400 Luminous Maximum trans-
Tint cate-
solar UV-B solar UV-A nm spectral trans- transmittance mittance
gory
transmittance transmittance mittance τ τ
v D65 SIR
τ τ 380 nm ≤ λ ≤ 780 780 nm ≤ λ ≤ 2000
SUVB SUVA
380-400
280 nm ≤ λ ≤ 315 315 nm ≤ λ ≤ 380 nm nm
380 nm ≤ λ ≤ 400 nm
nm nm
S0 0,05 τ 0,30 τ 0,75 τ τ > 80 % τ
v D65 v D65 v D65 v D65 v D65
43 % < τ ≤
v D65
S1 0,05 τ 0,30 τ 0,75 τ τ
v D65 v D65 v D65 v D65
80 %
1,0 % absolute or
0,05 τ 18 %< τ ≤
v D65 v D65
S2 0,25 τ 0,5 τ τ
v D65 v D65 v D65
whichever is 43 %
greater
8 % < τ ≤
v D65
S3 1,0% absolute 0,15 τ 0,5 τ τ
v D65 v D65 v D65
18 %
0,5 % absolute or
S4 1,0% absolute 0,15 τ 0,125 τ 3 % < τ ≤8 % τ
v D65 v D65 v D65 v D65
whichever is greater

NOTE Some national requirements may stipulate a different requirement for the long wavelength limit of UV-A.

5.3 General transmittance requirements
5.3.1 Uniformity of luminous transmittance and transmittance matching
5.3.1.1 Uniformly tinted lenses

Lenses that are intended to be uniformly tinted shall appear to be visually uniform within a circle 30

mm in diameter around the reference points or to the edge of the lens less the marginal zone 5 mm

wide, whichever is greater,and appear to have the same transmittance at the two reference points

when inspected against a white background in accordance with ISO 18526-3, 6.6. Where there is visible

non-uniformity, then, when tested according to ISO 18526-2, 7.4, the relative difference in the luminous

transmittance value between any two points of the lens shall not be greater than 15 % (relative to the

higher value), except for tint category S4 where it shall not be greater than 20 %.

Where there are visibly mismatched transmittances at the reference points, when measured in

accordance with ISO 18526-2, 7.5, the difference in luminous transmittance values at the reference

points for the right and left eyes shall not exceed 15 % (relative to the higher transmittance).

5.3.1.2 Linear gradient-tinted lenses

In the case of mounted linear gradient-tinted lenses, when inspected against a white background

in accordance with ISO 18526-3:—, 6.6, the luminous transmittances shall appear constant in the

horizontal direction and having equal transmittance at the reference points. Where there is visible

rotation of the gradient or visibly mismatched transmittances at the reference points, when measured

in accordance with ISO 18526-2, 7.5 the difference in the luminous transmittances between pairs

of points of the lens at the reference points and 15 mm to the left, to the right, above and below the

reference point shall not exceed 15 % (relative to the higher value).
5.3.1.3 Radial gradient-tinted lenses

When measured in accordance with ISO 18526-2, 7.5, the difference in the luminous transmittances

between pairs of points of the lens at the reference points and 15 mm to the left, to the right, above and

below the reference point shall not exceed 15 % (relative to the higher value),
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oSIST prEN ISO 18527-1:2018
ISO/DIS 18527-1:2018(E)
5.3.1.4 Variations due to thickness variations

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

are permitted. For verification, the test method in ISO 18526-2, 7.4.1.4 shall be used.

5.3.2 Ultraviolet transmittance of the frame or housing

When tested in accordance with ISO 18526-2, Clause 6, non-lens areas of goggles shall provide at least

the same level of protection against ultraviolet radiation, for the area to be protected according Clause

12, as given by a lens of any tint category declared usable with the goggle by the manufacturer or

supplier.
5.4 Special transmittance requirements
5.4.1 Photochromic lenses

The tint category of photochromic lenses 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 0 v 1

measured according to ISO 18526-2, Clause 14, at a temperature of (5 ± 2) °C. In both states, the

requirements specified in 5.2 and 5.3.1 shall be met. τ /τ shall be ≥ 1,25.
v 0 v 1
5.4.2 Polarizing lenses
5.4.2.1 Plane of transmission

If the lenses in the goggles are claimed to be polarizing, the lenses shall be fitted in the frame so that

their planes of transmission, when tested according to ISO 18526-2, 15.1, shall not deviate from the

vertical by more than ±5°. When the goggle is fitted with two separate lenses, any misalignment

between the planes of transmission of the left and right lenses shall not be greater than 6°.

5.4.2.2 Polarizing efficiency

When tested according to ISO 18526-2, 15.2, the polarization efficiency shall be > 78 % for lens

categories 2, 3, 4 and > 60 % for tint category 1.

NOTE These values are equivalent to ratios of the transmittance values parallel and perpendicular to the

plane of transmission of approximately 8:1 and 4:1 respectively.
5.4.3 Gradient-tinted lenses
5.4.3.1 General
Gradient-tinted lenses shall meet the transmittance requirements with
...