SIST EN ISO 9241-333:2017

Ergonomics of human-system interaction - Part 333: Stereoscopic displays using glasses (ISO 9241-333:2017)

This part of ISO 9241 provides ergonomic requirements for stereoscopic displays using glasses. These requirements are stated as performance specifications, aimed at ensuring effective and comfortable viewing conditions for users, and at reducing visual fatigue caused by stereoscopic images on stereoscopic display using glasses. Test methods and metrology, yielding conformance measurements and criteria, are provided for design evaluation.
This part of ISO 9241 is applicable to temporally or spatially interlaced type. These are implemented by flatpanel displays, projection displays, etc.
Stereoscopic displays using glasses can be applied to many contexts of use. However, this part focuses on business and home leisure applications (i.e., observing moving images, games, and so on). Only dark environments are specified in the current version of this part.

Ergonomie der Mensch-System-Interaktion - Teil 333: Stereoskopische Displays unter Verwendung von Brillen (ISO 9241-333:2017)

Dieser Teil von ISO 9241 liefert die ergonomischen Anforderungen für stereoskopische Displays unter Verwendung von Brillen. Diese Anforderungen werden als Leistungsvorschriften angegeben, die zum Ziel haben, ein effektives und bequemes Sehen der Benutzer sicherzustellen und die visuelle Ermüdung durch stereoskopische Bilder bei stereoskopischen Displays unter Verwendung von Brillen zu reduzieren. Prüfverfahren, Metrologie und Konformitätsverfahren und -kriterien für die Ergebnisse werden für die vorgesehene Bewertung vorgegeben.
Dieser Teil von ISO 9241 ist für die zeitlich verschachtelte und die räumlich verschachtelte Art anwendbar. Diese werden implementiert durch Flachbildschirme, Projektionsdisplays, etc.
Stereoskopische Displays unter Verwendung von Brillen können in zahlreichen Nutzungskontexten eingesetzt werden. Dieser Teil bezieht sich jedoch vorwiegend auf den geschäftlichen Bereich und Freizeitbereich zuhause (z. B. Beobachten von bewegten Bildern, Spielen etc.). Nur dunkle Umgebungen sind in der aktuellen Version dieses Teils spezifiziert.

Ergonomie de l'interaction homme-système - Partie 333: (ISO 9241-333:2017)

ISO 9241-333:2017 spécifie les exigences ergonomiques relatives aux écrans stéréoscopiques utilisant des lunettes conçues pour produire ou favoriser la parallaxe binoculaire. Ces exigences sont présentées sous forme de spécifications de performances visant à garantir des conditions de vision efficaces et confortables pour les utilisateurs ainsi qu'à réduire la fatigue visuelle causée par les images stéréoscopiques sur l'écran stéréoscopique utilisant des lunettes. Des méthodes d'essai et des données de métrologie, permettant d'obtenir des critères et des mesures pour la mise en conformité, sont fournies pour l'évaluation de la conception. Voir l'Annexe B pour les procédures de mesurage.
ISO 9241-333:2017 s'applique aux types d'affichage entrelacés dans le temps ou dans l'espace. Ces types sont mis en place au moyen de panneaux à écran plat, d'affichages à projection, etc.
Les écrans stéréoscopiques utilisant des lunettes peuvent être appliqués dans de nombreux contextes d'utilisation. Toutefois, le présent document porte principalement sur les applications liées aux activités professionnelles et récréatives (c'est-à-dire, l'observation d'images en mouvement, jeux, etc.). Seuls les environnements sombres sont spécifiés dans le présent document.
Pour l'explication technique des technologies d'affichage, voir l'Annexe C.

Ergonomija medsebojnega vpliva človek-sistem - 333. del: Stereoskopski zasloni z uporabo očal (ISO 9241-333:2017)

Ta del standarda ISO 9241 podaja ergonomske zahteve za stereoskopske zaslone, ki se uporabljajo z očali. Te zahteve so podane kot tehnične specifikacije, katerih namen je uporabnikom zagotavljati učinkovite in ugodne pogoje za gledanje ter zmanjšati utrujenost oči, ki je posledica gledanja stereoskopskih slik na stereoskopskih zaslonih z očali. Za vrednotenje zasnove so podane preskusne metode in meroslovje, ki omogočajo ugotavljanje skladnosti in podajajo merila zanjo. Ta del standarda ISO 9241 se uporablja za časovno in prostorsko povezane vrste zaslonov. Ti se uporabljajo v ploskih zaslonih, projekcijskih zaslonih itd.
Stereoskopski zasloni za uporabo z očali se lahko uporabljajo v različnih kontekstih. Ta del standarda se osredotoča na poslovno in domačo uporabo (tj. ogled premikajočih se slik, igre itd.) V trenutni različici tega dela dokumenta je opredeljena samo uporaba v temnih okoljih.

General Information

• Status: Published
• Public Enquiry End Date: 01-Jun-2016
• Publication Date: 07-Nov-2017
• ICS: 13.180 - Ergonomics
• ICS: 35.180 - IT Terminal and other peripheral equipment
• Technical Committee: VSN - Safety of machinery
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 13-Jun-2017
• Due Date: 18-Aug-2017
• Completion Date: 08-Nov-2017
• Ref Project: EN ISO 9241-333:2017 - Ergonomics of human-system interaction - Part 333: Stereoscopic displays using glasses (ISO 9241-333:2017)

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 9241-333:2017
01-december-2017
(UJRQRPLMDPHGVHERMQHJDYSOLYDþORYHNVLVWHPGHO6WHUHRVNRSVNL]DVORQL]
XSRUDERRþDO,62

Ergonomics of human-system interaction - Part 333: Stereoscopic displays using glasses

(ISO 9241-333:2017)

Ergonomie der Mensch-System-Interaktion - Teil 333: Stereoskopische Displays unter

Verwendung von Brillen (ISO 9241-333:2017)
Ergonomie de l'interaction homme-système - Partie 333: (ISO 9241-333:2017)
Ta slovenski standard je istoveten z: EN ISO 9241-333:2017
ICS:
13.180 Ergonomija Ergonomics
35.180 Terminalska in druga IT Terminal and other
periferna oprema IT peripheral equipment
SIST EN ISO 9241-333:2017 en,fr,de

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

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SIST EN ISO 9241-333:2017
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SIST EN ISO 9241-333:2017
EN ISO 9241-333
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 13.180; 35.180
English Version
Ergonomics of human-system interaction - Part 333:
Stereoscopic displays using glasses (ISO 9241-333:2017)

Ergonomie de l'interaction homme-système - Partie Ergonomie der Mensch-System-Interaktion - Teil 333:

333: Écrans stéréoscopiques utilisant des lunettes (ISO Stereoskopische Displays unter Verwendung von

9241-333:2017) Brillen (ISO 9241-333:2017)
This European Standard was approved by CEN on 6 April 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: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9241-333:2017 E

worldwide for CEN national Members.
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SIST EN ISO 9241-333:2017
EN ISO 9241-333:2017 (E)
Contents Page

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

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SIST EN ISO 9241-333:2017
EN ISO 9241-333:2017 (E)
European foreword
This document (EN ISO 9241-333:2017) has been prepared by Technical Committee

ISO/TC 159 “Ergonomics” in collaboration with Technical Committee CEN/TC 122 “Ergonomics” 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 November 2017, and conflicting national standards

shall be withdrawn at the latest by November 2017.

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

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

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 9241-333:2017 has been approved by CEN as EN ISO 9241-333:2017 without any

modification.
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SIST EN ISO 9241-333:2017
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SIST EN ISO 9241-333:2017
INTERNATIONAL ISO
STANDARD 9241-333
First edition
2017-04
Ergonomics of human-system
interaction —
Part 333:
Stereoscopic displays using glasses
Ergonomie de l’interaction homme-système —
Partie 333: Écrans stéréoscopiques utilisant des lunettes
Reference number
ISO 9241-333:2017(E)
ISO 2017
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SIST EN ISO 9241-333:2017
ISO 9241-333:2017(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. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 9241-333:2017
ISO 9241-333:2017(E)
Contents Page

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

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

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

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

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

3.1 General terms ........................................................................................................................................................................................... 1

3.2 Human factors ......................................................................................................................................................................................... 3

3.3 Performance characteristics........................................................................................................................................................ 4

4 Display technologies and their guiding principles ........................................................................................................... 4

5 Ergonomic requirements ............................................................................................................................................................................. 5

5.1 Viewing conditions .............................................................................................................................................................................. 5

5.1.1 General...................................................................................................................................................................................... 5

5.1.2 Design viewing distance ............................................................................................................................................ 5

5.1.3 Design viewing direction .......................................................................................................................................... 6

5.2 Luminance .................................................................................................................................................................................................. 6

5.2.1 General...................................................................................................................................................................................... 6

5.2.2 Illuminance ........................................................................................................................................................................... 6

5.2.3 Display luminance .......................................................................................................................................................... 6

5.3 Visual artefacts and fidelity.......................................................................................................................................................... 6

5.3.1 General...................................................................................................................................................................................... 6

5.3.2 Luminance non-uniformity ..................................................................................................................................... 7

5.3.3 Interocular luminance difference ...................................................................................................................... 7

5.3.4 Interocular crosstalk .................................................................................................................................................... 7

6 Optical laboratory test methods .......................................................................................................................................................... 8

6.1 General ........................................................................................................................................................................................................... 8

6.1.1 Basic measurements and derived procedures ....................................................................................... 8

6.1.2 Structure ................................................................................................................................................................................. 8

6.2 Measurement conditions ......... ....................................................................................................................................................... 9

6.2.1 Preparations and procedures ............................................................................................................................... 9

6.2.2 Test accessories .............................................................................................................................................................10

6.2.3 Test patterns .....................................................................................................................................................................10

6.2.4 Alignment: measurement location and meter position ..............................................................10

6.2.5 Light measuring device (LMD) .........................................................................................................................11

6.2.6 Measurement field ...................................................................... .................................................................................12

6.2.7 Angular aperture ..........................................................................................................................................................12

6.2.8 Meter time response ..................................................................................................................................................12

6.2.9 Test illumination ...........................................................................................................................................................12

6.2.10 Other ambient test conditions ..........................................................................................................................12

6.3 Measurement methods .................................................................................................................................................................13

6.3.1 Basic light measurements .....................................................................................................................................13

6.3.2 P 333.1: Luminance angular distribution................................................................................................15

6.3.3 P 334.1: Luminance angular uniformity ...................................................................................................15

6.3.4 Luminance analysis ....................................................................................................................................................16

6.3.5 P 337.1: Interocular luminance difference .............................................................................................18

6.3.6 P 338.1: Interocular crosstalk ...........................................................................................................................18

7 Analysis and compliance test methods ......................................................................................................................................20

7.1 Compliance routes ............................................................................................................................................................................20

7.1.1 Intended context of use ...........................................................................................................................................20

7.1.2 Design viewing direction range (angle of inclination and azimuth) ................................21

7.1.3 Information about the technology .................................................................................................................22

7.1.4 Compliance assessment ..........................................................................................................................................22

7.2 Conformance ..........................................................................................................................................................................................27

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Annex A (informative) Overview of the ISO 9241 series ...............................................................................................................28

Annex B (informative) Matrix of measurement procedures .....................................................................................................29

Annex C (informative) Technical explanation of display technologies ..........................................................................30

Bibliography .............................................................................................................................................................................................................................32

iv © ISO 2017 – All rights reserved
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SIST EN ISO 9241-333:2017
ISO 9241-333:2017(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: w w w . i s o .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4,

Ergonomics of human-system interaction.
A list of all parts in the ISO 9241 series can be found on the ISO website.
© ISO 2017 – All rights reserved v
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Introduction

Recently, due to the improvement of display technologies, users can easily experience stereoscopic

displays using glasses, such as TVs with large screen, personal computers, etc. The displays are used

not only in the field of leisure, but also in business, education and medical applications.

This document presents the requirements for visual display units (VDUs) with stereoscopic displays

using glasses.

ISO 9241-303 covers the display hardware aspect and gives basic requirements for head-mounted

displays (HMDs). ISO/TR 9241-331 presents the optical characteristics of autostereoscopic displays.

These other documents are closely related to stereoscopic displays using glasses, but are not directly

applicable to them, because the need for special glasses or its absence is an important factor in

ergonomics. The visual factors of HMDs are also ergonomically different from those of other displays.

This document is not included in the current ISO 9241-300 subseries for 2D displays because stereoscopic

displays have unique features. The development of a separate document to cover stereoscopic displays

offers better understanding of its unique features. For an overview of the entire ISO 9241 series, see

Annex A.
[19]

Moreover, IWA 3:2005 was published (since withdrawn) to discuss the image contents aspect. This

ISO International Workshop Agreement described image safety issues and means of reducing the

incidence of undesirable biomedical effects caused by visual image sequences. Visual fatigue caused by

stereoscopic images (VFSI) is one of these undesirable effects.

With this document and the related International Standards, the purpose is to develop guidelines for

image content where activities are closely related to the use of stereoscopic displays with glasses.

To ensure effective and comfortable viewing, and to reduce VFSI, the standards will need to address

both display hardware and the displayed contents. However, as the first step, this document focuses on

the display hardware aspect in order to simplify the discussions.
vi © ISO 2017 – All rights reserved
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SIST EN ISO 9241-333:2017
INTERNATIONAL STANDARD ISO 9241-333:2017(E)
Ergonomics of human-system interaction —
Part 333:
Stereoscopic displays using glasses
1 Scope

This document specifies ergonomic requirements for stereoscopic displays using glasses designed to

produce or facilitate binocular parallax. These requirements are stated as performance specifications,

aimed at ensuring effective and comfortable viewing conditions for users, and at reducing visual fatigue

caused by stereoscopic images on stereoscopic display using glasses. Test methods and metrology,

yielding conformance measurements and criteria, are provided for design evaluation. See Annex B for

measurement procedures.

This document is applicable to temporally or spatially interlaced types of display. These are implemented

by flat-panel displays, projection displays, etc.

Stereoscopic displays using glasses can be applied to many contexts of use. However, this document

focuses on business and home leisure applications (i.e. observing moving images, games, etc.). Only

dark environments are specified in this document.
For technical explanation of display technologies, see Annex C.
2 Normative references
There are no normative references in this document.
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:

— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 General terms
3.1.1
stereoscopic display
3D display where depth perception is induced by binocular parallax (3.2.1)
[SOURCE: ISO/TR 9241-331:2012, 2.1]
3.1.2
temporally interlaced type
temporally multiplexed type
temporally multiplexed display
temporally multiplexed stereoscopic display
stereoscopic display (3.1.1) that shows each of stereoscopic images sequentially
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ISO 9241-333:2017(E)
3.1.3
spatially interlaced type
spatially multiplexed type
spatially multiplexed display
spatially multiplexed stereoscopic display

stereoscopic display (3.1.1) that shows each of stereoscopic images divided in the screen

Note 1 to entry: As a result, each of stereoscopic images is shown simultaneously.

3.1.4
glasses

eye attachment for dividing stereoscopic images into each eye from a stereoscopic display (3.1.1) not

mounted on the user
3.1.5
active glasses

glasses (3.1.4) where the lenses differently change their optical properties synchronizing with the

stereoscopic display (3.1.1)

Note 1 to entry: Usually left and right images are displayed alternately on a screen. When a left image is displayed,

the left lens of active glasses is turned on to transmit the image and the right lens is turned off to cut off the image.

3.1.6
passive glasses
glasses (3.1.4) where the lenses have differently fixed optical properties
3.1.7
stereoscopic images
set of images with parallax shown on a stereoscopic display (3.1.1).
[SOURCE: ISO/TR 9241-331:2012, 2.1.7]
3.1.8
stereoscopic views

pair of sights provided by a stereoscopic display (3.1.1), which induce stereopsis

Note 1 to entry: See Figure 1.

Note 2 to entry: Oxford Dictionary defines stereopsis as “the perception of depth produced by the reception in

the brain of visual stimuli from both eyes in combination”.
[SOURCE: ISO/TR 9241-331:2012, 2.1.8]
2 © ISO 2017 – All rights reserved
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Key
1 autostereoscopic display 4 monocular view (left eye)
2 monocular view (left eye) 5 stereoscopic views
3 monocular view (right eye) 6 stereoscopic images

Figure 1 — Relationship between stereoscopic images, stereoscopic views and monocular view

3.1.9
monocular view
one stereoscopic view (3.1.8)
[SOURCE: ISO/TR 9241-331:2012, 2.1.9]
3.2 Human factors
3.2.1
binocular parallax

apparent difference in the direction of a point as seen separately by one eye and the other, while the

head remains in a fixed position

Note 1 to entry: Binocular parallax is equivalent to the optic angle between the visual axes of both eyes, when

they are fixated to a single point.
[SOURCE: ISO/IWA 3:2005, 2.15 — modified.]
3.2.2
visual fatigue

eyestrain or asthenopia, which shows a wide range of visual symptoms, including tiredness, headache,

and soreness of the eyes, caused by watching images in a visual display

Note 1 to entry: See ISO 9241-302:2008, 3.5.3 for the definition of “asthenopia”.

[SOURCE: ISO/IWA 3:2005, 2.13 — modified.]
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3.3 Performance characteristics
3.3.1
interocular crosstalk
leakage of the stereoscopic images (3.1.7) from one eye to the other

Note 1 to entry: In some cases, interocular crosstalk is referred to as “3D crosstalk”. In stereoscopic display (3.1.1)

using glasses (3.1.4), the crosstalk means interocular effect and therefore this document uses “interocular”

instead of “3D”.
3.3.2
interocular luminance difference

difference between the luminance values of the left and right views of a stereoscopic presentation

[SOURCE: ISO 9241-392:2014, 3.16]
3.3.3
pseudoscopic images
pseudostereoscopic images
set of images with inverted parallax shown on a stereoscopic display (3.1.1)
4 Display technologies and their guiding principles

For a satisfying human–display interaction, a number of different requirements have to be met at

the same time in an appropriate balance. These requirements have been grouped into the following

subjects:
— viewing conditions; see 5.1;
— luminance; see 5.2;
— visual artefacts and fidelity; see 5.3.

Each subject includes the related performance characteristics (see Table 1) and the display performance.

This document focuses on the significant performance characteristics for stereoscopic display using

glasses, which are marked with an asterisk in Table 1. Other performance characteristics, such as

“gaze and head tilt angles”, “luminance adjustment”, etc. are common to the ordinary 2D display, and

ISO 9241-303 should be applied.
Table 1 — Performance characteristics by subject
Subject Performance characteristic
Viewing conditions Design viewing distance
Design viewing direction
Gaze and head tilt angles
Luminance Illuminance
Display luminance
Luminance balance
Luminance adjustment
This performance characteristic is a focus of this document.
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Table 1 (continued)
Subject Performance characteristic
Visual artefacts Luminance non-uniformity
Colour non-uniformity
Contrast uniformity
Geometric distortions
Screen and faceplate defects
Temporal instability (flicker)
Spatial instability (jitter)
Moiré effects
Other instabilities
Unwanted reflections
Unwanted depth effects
Unwanted velocity and acceleration effects
Interocular luminance difference
Interocular chromaticity difference
Interocular contrast difference
Interocular crosstalk
Fidelity Colour gamut and reference white
Gamma and grey scale
Rendering of moving images
Image formation time
Spatial resolution
Raster modulation or fill factor
Pixel density
This performance characteristic is a focus of this document.
5 Ergonomic requirements
5.1 Viewing conditions
5.1.1 General

When viewing the stereoscopic display using glasses, conditions such as design viewing distance, design

viewing direction and head rotation (in-plain rotation) angles affect the viewer. In order to achieve

a comfortable viewing condition, the design viewing distance and direction need to be determined

properly.

NOTE When the viewer rotates his/her head, stereopsis is affected due to the mismatch of displayed parallax.

In this case, the effect of the displayed contents is evaluated first, and therefore the detailed requirements are

omitted from this document.
5.1.2 Design viewing distance

The design viewing distance is dependent on the application and the display hardware, such as the

display area size and the screen resolution. Therefore, the supplier of the display shall specify the

design viewing distance. If it is not specified, 1,3D should be applied, where D is the diagonal

view view
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of the active display area. Shorter viewing distances can be used in the smaller display (smaller than

9 inches diagonal).

NOTE In stereoscopic displays, the depth sensation is affected by the viewing distance. Many contents for

stereoscopic display using glasses assume the viewing distance to be 3H . 3H is equivalent to 1,3D , and

view view view
...