SIST EN ISO 24502:2011

Ergonomics - Accessible design - Specification of age-related luminance contrast for coloured light (ISO 24502:2010)

ISO 24502:2010 specifies the age-related luminance contrast of any two lights of different colour seen by a person at any age, by taking into account the age-related change of spectral luminous efficiency of the eye.
ISO 24502:2010 provides a basic method of calculation that can be applied to the design of lighting, visual signs and displays. It applies to light, self-luminous or reflected, in visual signs and displays seen under moderately bright conditions called photopic vision and whose spectral radiance is known or measurable. It does not apply to light seen under darker conditions called mesopic or scotopic vision.
ISO 24502:2010 specifies the luminance contrast for people aged from 10 to 79 years who have had no medical treatment or surgery on their eyes that may affect their spectral luminous efficiency.
ISO 24502:2010 does not apply to visual signs and displays seen by people with colour defects whose spectral luminous efficiency is different from those with normal colour vision, nor those seen by people with low vision.

Ergonomie - Zugängliche Gestaltung - Spezifikation des altersbezogenen Leuchtdichtekontrastes für farbiges Licht (ISO 24502:2010)

Diese Internationale Norm legt altersbezogene Leuchtdichtekontraste von jeglichen zwei Leuchten in verschiedenen Farben fest, die von einer Person jeden Alters unter Berücksichtigung der altersbedingten Veränderung spektraler Hellempfindlichkeit des Auges gesehen werden.
Diese Internationale Norm bietet ein einfaches Berechnungsverfahren, das für die Gestaltung von Beleuchtung, optischen Zeichen und Anzeigen verwendet werden kann. Es ist für selbstleuchtende oder reflektierte Leuchten in optischen Zeichen und Anzeigen anwendbar, die unter mäßig hellen optischen Bedingungen, genannt photopische Sicht/Tagessicht, zu sehen sind und deren spektrale Strahlungsdichte bekannt oder messbar ist. Es gilt nicht für Leuchten, die unter dunkleren Bedingungen, genannt mesopische (Dämmerungs)- oder skotopische (Nacht)sicht, zu sehen sind.
Diese Internationale Norm legt den Leuchtdichtekontrast für Menschen im Alter von 10 bis 79 Jahren fest, die keine medizinische oder chirurgische Behandlung an ihren Augen erfahren haben, die deren spektrale Hellempfindlichkeit beeinflussen könnte.
Diese Internationale Norm gilt nicht für optische Signale und Anzeigen, die von Menschen mit einer Behinderung der Farbensicht gesehen werden, deren spektrale Hellempfindlichkeit anders ist als die von Menschen mit normalem Farbensehen, und auch nicht für solche, die von Menschen mit schwachem Sehvermögen gesehen werden.

Ergonomie - Conception accessible - Spécification du contraste de luminance lié à l'âge pour la lumière colorée (ISO 24502:2010)

L'ISO 24502:2010 spécifie le contraste de luminance de deux lumières de couleur différente, en tenant compte de la variation de l'efficacité lumineuse relative spectrale de l'œil en fonction de l'âge de l'observateur.
Elle fournit une méthode de base de calcul pouvant être applicable à la conception des éclairages, des panneaux de signalisation et des affichages. Elle est applicable à la lumière, auto-luminescente ou réfléchie, des panneaux de signalisation et des affichages, observée dans des conditions de luminosité modérée («vision photopique») dont la densité spectrale de luminance est connue ou mesurable. Elle ne s'applique pas à la lumière observée dans des conditions d'environnement plus sombre («vision mésopique ou scotopique»).
L'ISO 24502:2010 spécifie le contraste de luminance pour les personnes âgées de 10 à 79 ans, n'ayant subi aucun traitement médical ou chirurgie oculaire susceptible d'affecter leur efficacité lumineuse relative spectrale.
Elle n'est pas applicable aux panneaux de signalisation et aux affichages observés par des personnes qui présentent une déficience de la vision des couleurs, pour qui l'efficacité lumineuse relative spectrale est différente de celle des personnes ayant une vision normale des couleurs, ni à ceux observés par des personnes ayant une faible vision.

Ergonomija - Dostopno načrtovanje - Določitev od staranja odvisnega kontrasta za barvno svetlobo (ISO 24502:2010)

Ta mednarodni standard določa od staranja odvisni kontrast za kateri koli dve svetlobi različne barve, ki ju vidi oseba pri kateri koli starosti, ob upoštevanju od starosti odvisnega spektralnega svetlobnega izkoristka. Ta mednarodni standard podaja osnovno metodo izračuna, ki se lahko uporabi pri načrtovanju osvetljave, vizualnih znakov ali prikazovalnikov. Velja za direktno in odbojno svetlobo pri vizualnih znakih in prikazovalnikih, vidnih pri zmerno svetlih pogojih, kar imenujemo fotopični vid, in kjer je spektralna odsevnost znana in merljiva. Ne velja za svetlobo, vidno pri temnejših pogojih, kar imenujemo mezopični ali skotopični vid. Ta mednarodni standard določa kontrast za ljudi od 10 do 79 let starosti, ki niso zdravili oči ali imeli na njih kirurškega posega, kar bi lahko vplivalo na spektralni svetlobni izkoristek. Ta mednarodni standard ne velja za vizualne znake ali prikazovalnike, ki jih vidijo ljudje z okvarami barvnega vida, katerih spektralni svetlobni izkoristek se razlikuje od izkoristka ljudi z normalnim barvnim vidom, niti ljudje s slabim vidom.

General Information

• Status: Published
• Public Enquiry End Date: 24-Sep-2009
• Publication Date: 05-Jun-2011
• ICS: 11.180.30 - Aids for blind or partially sighted people
• ICS: 13.180 - Ergonomics
• Technical Committee: VSN - Safety of machinery
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-Apr-2011
• Due Date: 03-Jul-2011
• Completion Date: 06-Jun-2011
• Ref Project: EN ISO 24502:2010 - Ergonomics - Accessible design - Specification of age-related luminance contrast for coloured light (ISO 24502:2010)

Overview

EN ISO 24502:2010 - “Ergonomics - Accessible design - Specification of age‑related luminance contrast for coloured light” (ISO 24502:2010) provides a standardized, calculation‑based method to assess and specify how two differently coloured lights will appear in luminance contrast to people of different ages. The standard addresses age‑related luminance contrast under normal (photopic) lighting conditions and is intended for use in the design of lighting, visual signs and electronic displays where spectral radiance can be measured.

Key topics and technical requirements

• Scope: Applies to self‑luminous or reflected coloured light seen under photopic vision; covers people aged 10–79 years who have had no eye surgery or treatment affecting spectral luminous efficiency. It does not apply to mesopic/scotopic conditions, people with colour‑vision defects or those with low vision.
• Calculation method: Uses an age‑related photopic spectral luminous efficiency function V_a(λ) (tabulated in decade steps for 10–79 years) and spectral radiance values (380–780 nm, typically 5 nm steps). The standard defines an equation that weights spectral radiance by V_a(λ) and sums across wavelengths to produce an age‑related luminance contrast between two lights.
• Data requirements: Spectral radiance of the lights must be known or measurable; interpolation to finer spectral resolution (e.g. 1 nm) may be used for higher accuracy.
• Contrast metrics: Uses contrast ratio as the basis (other contrast definitions such as Michelson or Weber contrast can also be applied according to ISO 24502 provisions).
• Normative references: Cross‑references relevant standards including ISO 3864 (safety colours/signs), ISO 9241 (visual displays), ISO 23539/CIE S 010 (photometry), and CIE guidance on colorimetry.

Practical applications

• Designing and specifying safety signage, traffic signs and wayfinding to ensure visibility for older adults.
• Setting colour and luminance requirements for electronic displays, control panels and instrument indicators in public, workplace and transport environments.
• Informing lighting design and material selection where coloured light contrasts are critical to legibility and perception.
• Supporting accessibility assessments and procurement specifications to meet ergonomics and inclusive design goals.

Who should use this standard

• Lighting designers and engineers
• Signage and display manufacturers
• Human factors / ergonomics professionals and accessibility consultants
• Architects, urban planners and transport authorities
• Product standards writers, compliance officers and regulatory bodies

Related standards

• ISO/IEC Guide 71 (accessible design principles)
• ISO/TR 22411 (visual environment ergonomics guidance)
• ISO 3864, ISO 9241, ISO 23539 / CIE photometry and colorimetry documents

Using EN ISO 24502:2010 helps ensure that colour contrast decisions are evidence‑based and age‑inclusive, improving legibility and safety across built and digital environments.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2011
(UJRQRPLMD'RVWRSQRQDþUWRYDQMH'RORþLWHYRGVWDUDQMDRGYLVQHJDNRQWUDVWD]D
EDUYQRVYHWORER,62
Ergonomics - Accessible design - Specification of age-related luminance contrast for
coloured light (ISO 24502:2010)
Ergonomie - Zugängliche Gestaltung - Spezifikation des altersbezogenen
Leuchtdichtekontrastes für farbiges Licht (ISO 24502:2010)
Ergonomie - Conception accessible - Spécification du contraste de luminance lié à l'âge
pour la lumière colorée (ISO 24502:2010)
Ta slovenski standard je istoveten z: EN ISO 24502:2010
ICS:
11.180.30 3ULSRPRþNLLQSULODJRGLWYH]D Aids and adaptations for
EUDQMH reading
13.180 Ergonomija Ergonomics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 24502
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 11.180.30; 13.180
English Version
Ergonomics - Accessible design - Specification of age-related
luminance contrast for coloured light (ISO 24502:2010)
Ergonomie - Conception accessible - Spécification du Ergonomie - Zugängliche Gestaltung - Leitlinien für die
contraste de luminance lié à l'âge pour la lumière colorée Spezifikation des altersbezogenen Leuchtdichte-Kontrastes
(ISO 24502:2010) für farbiges Licht (ISO 24502:2010)
This European Standard was approved by CEN on 14 December 2010.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24502:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 24502:2010) 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 June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 24502:2010 has been approved by CEN as a EN ISO 24502:2010 without any modification.

INTERNATIONAL ISO
STANDARD 24502
First edition
2010-12-15
Ergonomics — Accessible design —
Specification of age-related luminance
contrast for coloured light
Ergonomie — Conception accessible — Spécification du contraste de
luminance lié à l'âge pour la lumière colorée

Reference number
ISO 24502:2010(E)
©
ISO 2010
ISO 24502:2010(E)
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ii © ISO 2010 – All rights reserved

ISO 24502:2010(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Age-related luminance contrast.3
5 Using age-related luminance contrast .6
Annex A (informative) An example of calculation and application of age-related luminance
contrast.7
Bibliography.10

ISO 24502:2010(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 24502 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 5,
Ergonomics of the physical environment.
iv © ISO 2010 – All rights reserved

ISO 24502:2010(E)
Introduction
Although the proportion of older people is increasing in many countries, the care for better visibility of signs
and displays is not sufficiently taken for those older people. This prevents older people from actively being
involved in social activities, as well as from living their life safely and comfortably. This International Standard
provides a method of calculating age-related luminance contrast that can be used for assessing and designing
signs and displays in our visual environment, so that they are clearly visible to older people. This method
calculates age-related luminance contrast for people aged from 10 to 79 years based on age-related photopic
spectral luminous efficiency of the eye.
This International Standard adopts the principles of accessible design given in ISO/IEC Guide 71 and
amplified in ISO/TR 22411.
INTERNATIONAL STANDARD ISO 24502:2010(E)

Ergonomics — Accessible design — Specification of age-
related luminance contrast for coloured light
1 Scope
This International Standard specifies the age-related luminance contrast of any two lights of different colour
seen by a person at any age, by taking into account the age-related change of spectral luminous efficiency of
the eye.
This International Standard provides a basic method of calculation that can be applied to the design of lighting,
visual signs and displays. It applies to light, self-luminous or reflected, in visual signs and displays seen under
moderately bright conditions called photopic vision and whose spectral radiance is known or measurable. It
does not apply to light seen under darker conditions called mesopic or scotopic vision.
This International Standard specifies the luminance contrast for people aged from 10 to 79 years who have
had no medical treatment or surgery on their eyes that may affect their spectral luminous efficiency.
This International Standard does not apply to visual signs and displays seen by people with colour defects
whose spectral luminous efficiency is different from those with normal colour vision, nor those seen by people
with low vision.
2 Normative references
The following refererenced documents are indispensable for the application 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.
1)
ISO 3864-1:— , Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety
signs and safety markings
2)
ISO 3864-4:— , Graphical symbols — Safety colours and safety signs — Part 4: Colorimetric and photometric
properties of safety sign materials
ISO 9241-302:2008, Ergonomics of human-system interaction — Part 302: Terminology for electronic visual
displays
ISO 9241-303:2008, Ergonomics of human-system interaction — Part 303: Requirements for electronic visual
displays
ISO 23539/CIE S 010, Photometry — The CIE system of physical photometry
CIE 15, Colorimetry
CIE 17.4-1987, International lighting vocabulary

1) To be published. (Revision of ISO 3864-1:2002)
2) To be published.
ISO 24502:2010(E)
3 Terms and definitions
3.1
luminous efficiency
ratio of radiant flux weighted according to V(λ) to the corresponding radiant flux
[CIE 17.4-1987]
3.2
spectral luminous efficiency
〈of a monochromatic radiation of wavelength λ (V(λ) for photopic vision; V′(λ) for scotopic vision〉 ratio of the
radiant flux at wavelength λ to that at wavelength λ, such that both radiations produce equally intense
m
luminous sensations under specified photometric conditions and λ is chosen so that the maximum value of
m
this ratio is equal to 1
NOTE 1 Adapted from CIE 17.4-1987.
NOTE 2 The values for spectral luminous efficiency in photopic vision are given in ISO 23539/CIE S 010.
3.3
radiant flux
power emitted, transformed or received in the form of radiation
NOTE The radiant flux is expressed in watts (W).
[CIE 17.4-1987]
3.4
age-related photopic spectral luminous efficiency
V (λ)
a
spectral luminous efficiency defined as a function of age, a
3.5
luminance contrast
ratio between the higher luminance, L , and lower luminance, L , that defines the feature to be detected
H L
NOTE 1 If measured by contrast modulation (or Michelson contrast) it is defined as:
L − L
HL
C = (1)
m
L + L
HL
or, if measured by contrast ratio (CR), it is defined as:
L
H
CR= (2)
L
L
NOTE 2 Contrast ratio, CR, is often used for high luminances. When near the luminance-detection threshold, some use
the following form (also known as Weber contrast):
L − L
HL
C = (3)
w
L
L
NOTE 3 For some but not all displays, area-luminance targets can be used to approximate the luminances that define
the feature to be detected because pixels are discrete and near-area luminance is sufficiently uniform.
[ISO 9241-302:2008]
NOTE 4 Equation (2) is used in this International Standard. Equations (1) and (3) may also be used to calculate age-
related luminance contrast.
2 © ISO 2010 – All rights reserved

ISO 24502:2010(E)
3.6
age-related luminance contrast
C (λ)
a
luminance contrast defined as a function of age, a
NOTE The formula is given in Equation (4).
3.7
photopic vision
...