EN ISO 8598-1:2014

SLOVENSKI STANDARD
01-november-2014
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Optics and optical instruments - Focimeters - Part 1: General purpose instruments used
for measuring spectacle lenses (ISO 8598-1:2014)
Optik und optische Instrumente - Scheitelbrechwert-Messgeräte - Teil 1: Instrumente für
den allgemeinen Gebrauch zur Verwendung für die Brillenglas-Messung (ISO 8598-
1:2014)
Optique et instruments d'optique - Frontofocomètres - Partie 1: Instruments pour cas
généraux pour le mesurage des verres de lunettes (ISO 8598-1:2014)
Ta slovenski standard je istoveten z: EN ISO 8598-1:2014
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 8598-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2014
ICS 11.040.70 Supersedes EN ISO 8598:1998
English Version
Optics and optical instruments - Focimeters - Part 1: General
purpose instruments used for measuring spectacle lenses (ISO
8598-1:2014)
Optique et instruments d'optique - Frontofocomètres - Optik und optische Instrumente - Scheitelbrechwert-
Partie 1: Instruments pour cas généraux pour le mesurage Messgeräte - Teil 1: Instrumente für den allgemeinen
des verres de lunettes (ISO 8598-1:2014) Gebrauch zur Verwendung für die Brillenglas-Messung
(ISO 8598-1:2014)
This European Standard was approved by CEN on 22 April 2014.

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, 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
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8598-1:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 8598-1:2014) 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 March 2015, and conflicting national standards shall be withdrawn at
the latest by March 2015.
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.
This document supersedes EN ISO 8598:1998.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 8598-1:2014 has been approved by CEN as EN ISO 8598-1:2014 without any modification.
INTERNATIONAL ISO
STANDARD 8598-1
First edition
2014-09-15
Optics and optical instruments —
Focimeters —
Part 1:
General purpose instruments
Optique et instruments d’optique — Frontofocomètres —
Partie 1: Instruments pour cas généraux
Reference number
ISO 8598-1:2014(E)
©
ISO 2014
ISO 8598-1:2014(E)
© ISO 2014
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
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Tel. + 41 22 749 01 11
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E-mail copyright@iso.org
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Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 8598-1:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements for general purpose focimeters . 3
5 Metrological requirements . 5
5.1 General . 5
5.2 Reference wavelength . 5
5.3 Performance requirement . 5
6 Test procedures . 8
6.1 General . 8
6.2 Checking the indication errors . 8
6.3 Checking the axis marker for the optical centre of lens . 8
6.4 Checking the alignment of the axis marker . 9
6.5 Checking the adjusting rail . 9
6.6 Checking the non-symmetric error for automated focimeters . 9
6.7 Checking the repeatability of vertex power measurement for automated focimeters .10
6.8 Checking for the centration error .10
6.9 Checking the capability of focimeters to measure tinted lenses .10
6.10 Checking the astigmatic axis repeatability for low-powered cylinder lens .10
6.11 Special procedures for eyepiece focimeters .11
6.12 Criterion for image focusing in manual focusing focimeters .11
7 Marking .11
7.1 Reference to ISO 8598-1 .11
7.2 General information to be supplied by the manufacturer .11
7.3 Additional information to be supplied by the manufacturer .12
Annex A (informative) Use of correction values when measuring spectacle lenses .13
Annex B (informative) Example for evaluation of uncertainty of measurement for automated
focimeters for general use .18
Annex C (normative) Specifications of special reference lenses .24
Annex D (informative) Information for users on the performance of general purpose focimeters
covered by this part of ISO 8598 .26
Bibliography .27
ISO 8598-1:2014(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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 172, Optics and photonics, Subcommittee SC 7,
Ophthalmic optics and instruments.
This first edition of ISO 8598-1 cancels and replaces ISO 8598:1996, of which it constitutes a technical
revision. It also incorporates the Technical Corrigendum ISO 8598:1996/Cor.1:1998.
ISO 8598 consists of the following parts, under the general title Optics and optical instruments —
Focimeters:
— Part 1: General purpose instruments
iv © ISO 2014 – All rights reserved

ISO 8598-1:2014(E)
Introduction
General purpose focimeters are intended for measurement of contact lenses, single-vision, multifocal
and progressive-power or degressi
...