EN ISO 9342:1998

Optics and optical instruments - Test lenses for calibration of focimeters (ISO 9342:1996)

Specification of tolerance of lenses for the calibration of focimeters

Optik und optische Instrumente - Prüfgläser zur Kalibrierung von Scheitelbrechwert-Meßgeräten (ISO 9342:1996)

Diese Internationale Norm legt Anforderungen an Prüfgläser zur Kalibrierung von Scheitelbrechwert-Meßgeräten fest. Anmerkung 1: Die Verwendung anderer Prüfgläser, deren Brechwert im angegebenen Bereich liegt und die bezüglich Genauigkeit und Form gleichwertig gefertigt wurden, jedoch andere Scheitelbrechwerte aufweisen, ist ebenfalls zulässig. Für die Kalibrierung von digital rundenden Scheitelbrechwert-Meßgeräten können jedoch nur Prüfgläser mit einem ganzzahligen Sollbrechwert, wie in Anhang A beschrieben, verwendet werden.

Optique et instruments d'optique - Verres étalons pour l'étalonnage des frontofocomètres (ISO 9342:1996)

Optika in optični instrumenti - Preskusne leče za umerjanje fokometrov (ISO 9342:1996)

General Information

• Status: Withdrawn
• Publication Date: 07-Jul-1998
• Withdrawal Date: 30-Apr-2005
• ICS: 11.040.70 - Ophthalmic equipment
• Technical Committee: CEN/TC 170 - Ophthalmic optics
• Drafting Committee: CEN/TC 170 - Ophthalmic optics
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 01-May-2005
• Completion Date: 01-May-2005
• Ref Project: SIST EN ISO 9342:2000 - Optics and optical instruments - Test lenses for calibration of focimeters (ISO 9342:1996)

Relations

• Replaced By: EN ISO 9342-1:2005 - Optics and optical instruments - Test lenses for calibration of focimeters - Part 1: Test lenses for focimeters used for measuring spectacle lenses (ISO 9342-1:2005)
• Effective Date: 22-Dec-2008
• Replaced By: EN ISO 9342-2:2005 - Optics and optical instruments - Test lenses for calibration of focimeters - Part 2: Test lenses for focimeters used for measuring contact lenses (ISO 9342-2:2005)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 9342:2000
01-januar-2000
2SWLNDLQRSWLþQLLQVWUXPHQWL3UHVNXVQHOHþH]DXPHUMDQMHIRNRPHWURY,62

Optics and optical instruments - Test lenses for calibration of focimeters (ISO 9342:1996)
Optik und optische Instrumente - Prüfgläser zur Kalibrierung von Scheitelbrechwert-
Meßgeräten (ISO 9342:1996)
Optique et instruments d'optique - Verres étalons pour l'étalonnage des frontofocometres
(ISO 9342:1996)
Ta slovenski standard je istoveten z: EN ISO 9342:1998
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 9342:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9342:2000

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SIST EN ISO 9342:2000

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SIST EN ISO 9342:2000

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SIST EN ISO 9342:2000

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SIST EN ISO 9342:2000

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SIST EN ISO 9342:2000
ISO
INTERNATIONAL
9342
STANDARD
First edition
1996-08-15
Optics and Optical instruments - Test
lenses for calibration of focimeters
Verres Betalons pour I’htalonnage des
Optique et hstruments d’optique -
fron tofocome tres
Reference number
ISO 9342:1996(E)

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SIST EN ISO 9342:2000
ISO 9342: 1996(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide fed-
eration 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
(IEC) 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 9342 was prepared by Technical Committee
ISOPC 172, Optics and optical instruments, Subcommittee SC 7, Oph-
thalmic op tks and ins trumen ts.
Annex A of this International Standard is for information only.
0 ISO 1996
All rights reserved. Unless otherwise specified, 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 Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 9342:2000
INTERNATIONAL STANDARD @ ISO
ISO 9342: 1996(E)
Optics and Optical instruments - Test lenses for
calibration of focimeters
3.2 prismatic test lenses: Lenses used for the cali-
1 Scope
bration of the prismatic deviation measurements by
focimeters, in which the prismatic power of each lens
This International Standard specifies requirements for
is expressed in centimetres deviation per metre dis-
test lenses for the calibration of focimeters.
tance (cm/m).
NOTE 1 It is accepted that other test lenses tan also be
NOTE 2 The special name for the unit for expressing
used with powers within the given range, manufactured to
prismatic power is the ‘prism dioptre’ for which the Symbol
the same Standard of accuracy and form, but different back
‘A’ is used.
vertex powers. However, only lenses with integer nominal
powers, as described in Annex A, tan be used for the cali-
3.3 cylindrical test lenses: Lenses with cylindrical
bration of digitally-rounding focimeters.
faces which are used to calibrate the axis marker and
axis indicator with respect to the adjustment orien-
tation of the rail.
2 Normative reference
NOTE 3 These lenses are usually specially designed and
marked.
The following Standard contains provisions which,
through reference in this text, constitute provisions of
3.4 reference wavelength: Wavelengths specified
this International Standard. At the time of publication,
in ISO 7944.
the edition indicated was valid. All Standards are sub-
ject to revision, and Parties to agreements based on
NOTES
this International Standard are encouraged to investi-
gate the possibility of applying the most recent edition
4 For the purposes of this International Standard, the ref-
erence wavelengths are either the green mercury line
of the Standard indicated below. Members of IEC and
(& = 546,07 nm) or the yellow helium line (hd = 587,56 nm).
ISO maintain registers of currently valid International
Standards.
5 The reference wavelength for which the test lenses are
calibrated should be stated.
ISO 7944:1984, Optics and optical instruments -
ßeference wavelengths.
4 Design requirements and
3 Definitions
recommendations for test lenses
For the purposes of this International Standard, the
4.1 General
following definitions apply.
Test lenses shall be made of homogeneous
3.1 spherical test lenses: Lenses used for the cali- white crown glass with a ref ractive index
bration of the dioptric power measurements by foci- nd = 1,523 I1: 0,002, or ne = 1,525 + 0,002 selected
meters, in which the power of each lens is expressed to be free of bubbles and striae in an area of 4 mm
as its back vertex power in dioptres (D). radius surrounding the centre of the free aperture.

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SIST EN ISO 9342:2000
ISO 9342: 1996(E) @ ISO
NOTE 6 Test lenses should have a protective mount,
For a complete set, the following set of prismatic de-
which is designed so that, when the lens is correctly placed
viations is recommended:
on the lens support, the focimeter is not obstructed.
2A 5A IOA 15A 206
4.2 Spherical test lenses
For a complete set of spherical test lenses the follow-
ing set of back vertex powers is recommended:
4.4 Cylindrica I test
lenses
-25 D, -20 D, -15 D, -10 D, -5 D, +5 D, -t-IO D,
The test lens shall be a rectangular positive plano cyl-
+15 D, +20 D, +25 D
inder of at least 5 D and shall have the dimensions
shown in figure 1. The cylinder axis shall be parallel to
Spherical test lenses should have a free aperture of at
the longer side of the rectangle and shall be marked
least 15 mm.
by a centreline. One of the longer sides shall be
marked as the reference side.
In Order to minimize the influence of spherical aber-
ration, the curvature of the back surface and the cen-
tre thickness shall approximately correspond to those
of common spectacle lenses. Table 1 gives nominal
back surface powers and ranges for cen
...