EN ISO 8596:1996
(Main)Ophthalmic optics - Visual acuity testing - Standard optotype and its presentation (ISO 8596:1994)
Ophthalmic optics - Visual acuity testing - Standard optotype and its presentation (ISO 8596:1994)
Migrated from Progress Sheet (TC Comment) (2000-07-10): RG
Augenoptik - Sehschärfeprüfung - Das Normsehzeichen und seine Darbietung (ISO 8596:1994)
Diese Internationale Norm legt eine Reihe von Landoltring-Sehzeichen fest und beschreibt ein Verfahren zur Messung der Sehschärfe für die Ferne unter Tageslichtbedingungen für gütachterliche Zwecke und Zulassungsverfahren.Sie ist weder als Norm für klinische Messungen noch zur Bestätigung von Blindheit oder Sehbehinderung vorgesehen. Anmerkung 1: Zum Zwecke der Messung der Sehschärfe sollten das Normsehzeichen oder andere Sehzeichen, die an das Normsehzeichen angeschlossen wurden (wie in ISO 8597 beschrieben), benutzt werden.
Optique ophtalmique - Mesure de l'acuité visuelle - Optotype normalisé et sa présentation (ISO 8596:1994)
La CEI 61907:2009 fournit des lignes directrices relatives à l'ingénierie de la sûreté de fonctionnement des réseaux de communication. Elle définit un cadre général pour garantir la sûreté de fonctionnement des réseaux, fournit un processus de mise en oeuvre de la sûreté de fonctionnement des réseaux, présente des critères et une méthodologie de conception technologique des réseaux, d'évaluation de la performance, ainsi que des considérations d'ordre sécuritaire et de mesure de la qualité de service nécessaires à la réalisation des objectifs de sûreté de fonctionnement des réseaux. La présente norme s'adresse aux développeurs et fournisseurs d'équipements réseau, aux intégrateurs de réseau et aux fournisseurs de prestations de services de réseau afin de leur permettre de planifier, d'évaluer et de mettre en oeuvre la sûreté de fonctionnement des réseaux.
Očesna optika - Preskušanje ostrine vida - Standardni optotip in njegova predstavitev (ISO 8596:1994)
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 8596:2000
01-januar-2000
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Ophthalmic optics - Visual acuity testing - Standard optotype and its presentation (ISO
8596:1994)
Augenoptik - Sehschärfeprüfung - Das Normsehzeichen und seine Darbietung (ISO
8596:1994)
Optique ophtalmique - Mesure de l'acuité visuelle - Optotype normalisé et sa
présentation (ISO 8596:1994)
Ta slovenski standard je istoveten z: EN ISO 8596:1996
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 8596:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 8596:2000
INTERNATIONAL ISO
8596
STANDARD
First edition
1994-02-15
Ophthalmic optics - Visual acuity
- Standard optotype and its
testing
presentation
Mesure de I ’acuit6 visuelle - Optotype
Op tique oph talmique -
normalis6 et sa pksentation
Reference number
ISO 8596: 1994(E)
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SIST EN ISO 8596:2000
ISO 8596: 1994(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. Esch 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
(1 EC) on all matters of electrotechnical standardization.
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.
International Standard ISO 8596 was prepared by Technical Committee
ISOnC 172, Optics and optical instruments, Sub-Committee SC 7,
Ophthalmic, endoscopic, metrological instruments and test methods.
0 ISO 1994
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronie or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1 211 Geneve 20 l Switzerland
Printed in Switzerland
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SIST EN ISO 8596:2000
INTERNATIONAL STANDARD ISO 8596: 1994(E)
Ophthalmic optics - Visual acuity testing -
Standard optotype and its presentation
Consilium Ophthalmologicum Universale - Visual
1 Scope
Functions Committee, Visual Acuity Measurement
Standard. Ital. J. Ophthalmol. ll/l (1988), pp. 5-l 9.
This International Standard specifies a range of
Landolt ring optotypes and describes a method for
measuring distance visual acuity under daylight con-
ditions for the purposes of certification or licensing.
3 Standard optotype
lt is neither intended as a Standard for clinical
The Standard optotype shall be the Landolt ring as
measurements nor for the certification of blindness
detailed in table 1 and as shown in figure 1.
or partial sight.
The visual acuity grade 1 shall be represented by a
NOTE 1 For the purposes of measuring visual acuity, the
Landolt ring whose outer diameter, d, subtends an
Standard optotype, or other optotypes which have been
angle of 5’ and whose width, as well as the gap in its
correlated with the Standard optotype (as described in
continuity, subtends an angle of 1’ at the designated
ISO 8597), should be used.
viewing distance.
For clinical use, see the recommendation prepared by
The Landolt ring shall be capable of being presented
the Visual Functions Committee of the International
in eight different positions (see 6.2).
Council of Ophthalmology (see clause 2).
2 Normative references
4 Visual acuity grades and Standard
The following Standards contain provisions which,
optotype grades
through reference in this text, constitute provisions
of this International Standard. At the time of publi-
The visual acuity grades shall be as given in table 1
cation, the editions indicated were valid. All Standards
and shall be expressed as the reciprocal of the gap
are subject to revision, and Parties to agreements
width measured in minutes of arc.
based on this International Standard are encouraged
to investigate the possibility of applying the most re-
The acuity values for the size of the optotype shall be
cent editions of the Standards indicated below.
graduated logarithmically. The quotient of the size of
Members of IEC and ISO maintain registers of cur-
a test type and that of the next smaller one shall be:
rently valid International Standards.
10
10 - 1,2589 (series of preferred numbers R10
d-
ISO 3: 1973, Preferred numbers - Series of preferred
from ISÖ 3).
numbers.
Optotypes of acuity grades 0,05, 0,06, 0,08 and 2,0
ISO 8597: -l), Optics and Optical instruments - Vis- may be omitted if necessary. Addition of further acuity
ual acuity testing - Method o f correla ting optotypes. grades is permitted.
1) To be published.
1
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SIST EN ISO 8596:2000
ISO 8596: 1994(E)
Table 1 - Visual acuity grades
Qptotype size
Minimum number of
Angle for gap
...
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