Ophthalmic optics - Visual acuity testing -- Standard and clinical optotypes and their presentation (ISO 8596:2017)

ISO 8596:2017 specifies a range of Landolt ring optotypes and describes a method for measuring distance visual acuity under photopic conditions for the purposes of certification or licensing.
ISO 8596:2017 is neither intended as a standard for clinical measurements nor for the certification of blindness or partial sight.
Other optotypes used for clinical investigations are described in Annex A for information.

Augenoptik - Sehschärfeprüfung - Normsehzeichen und klinische Sehzeichen und ihre Darbietung (ISO 8596:2017)

Dieses Dokument legt eine Reihe von Landoltring Sehzeichen fest und beschreibt ein Verfahren zur Messung der Sehschärfe für die Ferne unter photopischen Bedingungen (Tageslichtbedingungen) für gutachterliche Zwecke oder Zulassungs¬verfahren.
Dieses Dokument ist weder als Norm für klinische Messungen noch zur Begutachtung von Blindheit oder Sehbehinderung vorgesehen.
Andere Sehzeichen für die klinische Untersuchung werden im informativen Anhang A beschrieben

Optique ophtalmique - Mesure de l'acuité visuelle - Optotype normalisé et optotypes cliniques et leur présentation (ISO 8596:2017)

ISO 8592:2017 spécifie une gamme d'optotypes constitués d'anneaux de Landolt et décrit une méthode de mesure de l'acuité visuelle en vision de loin, dans le domaine photopique, à des fins de délivrance d'attestations ou de permis.
ISO 8592:2017 n'a pas vocation à traiter des mesurages effectués lors des examens cliniques ou en vue d'un certificat pour cécité ou baisse de la vue.
D'autres optotypes utilisés lors des examens cliniques sont décrits dans l'Annexe A à titre d'information.

Očesna optika - Preskušanje ostrine vida - Standardni in klinični optotip in njuna predstavitev (ISO 8596:2017)

Ta dokument določa optotipe Landoltovega kolobarja in opisuje metodo za merjenje ostrine vida na daljavo v fotopičnih pogojih za namene certificiranja ali licenciranja. Ta dokument ni namenjen za uporabo kot standard za klinične meritve ali za potrditev slepote ali slabovidnosti.
Drugi optotipi, ki se uporabljajo za klinične preiskave, so opisani v dodatku A.

General Information

Status
Published
Publication Date
23-Jan-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
24-Jan-2018
Completion Date
24-Jan-2018

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SIST EN ISO 8596:2018
01-marec-2018
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SIST EN ISO 8596:2009

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Ophthalmic optics - Visual acuity testing - Standard and clinical optotypes and their

presentation (ISO 8596:2017)

Augenoptik - Sehschärfeprüfung - Normsehzeichen und klinische Sehzeichen und ihre

Darbietung (ISO 8596:2017)

Optique ophtalmique - Mesure de l'acuité visuelle - Optotype normalisé et optotypes

cliniques et sa présentation (ISO 8596:2017)
Ta slovenski standard je istoveten z: EN ISO 8596:2018
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 8596:2018 en

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

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SIST EN ISO 8596:2018
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SIST EN ISO 8596:2018
EN ISO 8596
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2018
EUROPÄISCHE NORM
ICS 11.040.70 Supersedes EN ISO 8596:2009
English Version
Ophthalmic optics - Visual acuity testing -- Standard and
clinical optotypes and their presentation (ISO 8596:2017)

Optique ophtalmique - Mesure de l'acuité visuelle - Augenoptik - Sehschärfeprüfung - Normsehzeichen

Optotype normalisé et optotypes cliniques et leur und klinische Sehzeichen und ihre Darbietung (ISO

présentation (ISO 8596:2017) 8596:2017)
This European Standard was approved by CEN on 20 November 2017.

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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8596:2018 E

worldwide for CEN national Members.
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SIST EN ISO 8596:2018
EN ISO 8596:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 8596:2018
EN ISO 8596:2018 (E)
European foreword

This document (EN ISO 8596:2018) has been prepared by Technical Committee ISO/TC 172 “Optics and

photonics” 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 July 2018, and conflicting national standards shall be

withdrawn at the latest by July 2018.

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

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 8596:2009.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 8596:2017 has been approved by CEN as EN ISO 8596:2018 without any modification.

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SIST EN ISO 8596:2018
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SIST EN ISO 8596:2018
INTERNATIONAL ISO
STANDARD 8596
Third edition
2017-11
Ophthalmic optics — Visual acuity
testing — Standard and clinical
optotypes and their presentation
Optique ophtalmique — Mesure de l'acuité visuelle — Optotype
normalisé et optotypes cliniques et leur présentation
Reference number
ISO 8596:2017(E)
ISO 2017
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SIST EN ISO 8596:2018
ISO 8596:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 8596:2018
ISO 8596:2017(E)
Contents Page

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

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

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

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

4 Requirements .......................................................................................................................................................................................................... 2

4.1 Specifications of the standard optotype............................................................................................................................ 2

4.2 Visual acuity grades and standard optotype grades ............................................................................................... 3

4.3 Test area and spacing between standard optotypes .............................................................................................. 4

4.4 Positions of the optotype ............................................................................................................................................................... 4

4.5 Quality of presentation .................................................................................................................................................................... 4

4.6 Luminance .................................................................................................................................................................................................. 5

5 Test methods ............................................................................................................................................................................................................. 6

5.1 Viewing distance for distance visual acuity testing ................................................................................................ 6

5.2 Criteria for determination and assignment of visual acuity grade ............................................................ 6

6 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) Optotypes for clinical investigations ...................................................................................................... 7

Bibliography .............................................................................................................................................................................................................................10

© ISO 2017 – All rights reserved iii
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SIST EN ISO 8596:2018
ISO 8596:2017(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 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 the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee

SC 7, Ophthalmic optics and instruments.

This third edition cancels and replaces the second edition (ISO 8596:2009), which has been technically

revised.
The main changes compared to the previous edition are as follows:
a) restructuring of technical content into the Clauses 4 and 6 has been applied;

b) terms and definitions with the terms standard optotype, clinical optotype, visual acuity, and

the systems decimal visual acuity, Snellen fraction, LogMAR acuity, and visual acuity grade have

been added;
c) Snellen fraction values in Table 1 have been added;
d) Figure 2 has been added;
e) Annex A has been added.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 8596:2018
INTERNATIONAL STANDARD ISO 8596:2017(E)
Ophthalmic optics — Visual acuity testing — Standard and
clinical optotypes and their presentation
1 Scope

This document specifies a range of Landolt ring optotypes and describes a method for measuring

distance visual acuity under photopic conditions for the purposes of certification or licensing.

This document is neither intended as a standard for clinical measurements nor for the certification of

blindness or partial sight.

Other optotypes used for clinical investigations are described in Annex A for information.

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 3:1973, Preferred numbers — Series of preferred numbers
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 https://www.iso.org/obp
3.1
standard optotype
Landolt ring
Note 1 to entry: The Landolt ring is specified in Table 1 and Figure 1.
3.2
clinical optotype

optotype other than the standard optotype (3.1) used for measuring visual acuity (3.3)

Note 1 to entry: This definition does not exclude the standard optotype from being used for the same purposes

as a clinical optotype.

Note 2 to entry: Since clinical optotypes can differ greatly in legibility, it is crucial to refer to the standard

optotype whenever the comparability of the results is important. ISO/TR 19498 provides a method for correlation

of clinical optotypes to the standard optotype.
3.3
visual acuity
number characterizing the ability of the visual system to recognize optotypes

Note 1 to entry: Currently, three different scaling systems are used to describe the visual acuity of a patient.

These are decimal visual acuity, Snellen fraction, LogMAR acuity. See Table 1.
© ISO 2017 – All rights reserved 1
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SIST EN ISO 8596:2018
ISO 8596:2017(E)
3.3.1
decimal visual acuity

reciprocal of the minimum recognizable gap width of a Landolt ring measured in minutes of arc

EXAMPLE A visual acuity of 1,0 is assigned when the smallest Landolt ring recognized by a patient has a gap

width of 1 min of arc measured from the patient’s viewing distance.
3.3.2
Snellen fraction

notation for specifying the angular subtense of an optotype, expressed as a fraction with the numerator

(test distance) being the distance at which visual acuity (3.3) is tested, commonly in m or ft, and the

denominator (normal distance) being the distance at which the critical detail (limb) of the smallest

recognizable optotype subtends 1 min of arc
V =
where
V is the visual acuity, measured as Snellen fraction;
D is the test distance, measured in m or ft;
D is the normal distance, measured in m or ft.
EXAMPLE A Snellen fraction
...

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