EN ISO 24502:2010

SLOVENSKI STANDARD
01-julij-2011
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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 (
...