EN ISO 9342-1:2005
(Main)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)
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)
ISO 9342-1:2005 specifies requirements for test lenses for the calibration of focimeters that are used for the measurement of spectacle form lenses.
Optik und optische Instrumente - Prüfgläser zur Kalibrierung von Scheitelbrechwert-Messgeräten - Teil 1: Prüfgläser für Scheitelbrechwert-Messgeräte für die Messung von Brillengläsern (ISO 9342-1:2005)
Dieser Teil von ISO 9342 legt Anforderungen an Prüfgläser zur Kalibrierung von Scheitelbrechwert-Mess-geräten, die für die Messung von Brillengläsern verwendet werden, fest.
ANMERKUNG 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 ganz-zahligen Sollscheitelbrechwert, wie in Anhang A beschrieben, verwendet werden.
Optique et instruments d'optique - Verres étalons pour l'étalonnage des frontofocomètres - Partie 1: Verres étalons pour frontofocomètres pour le mesurage des verres de lunettes (ISO 9342-1:2005)
L'ISO 9342-1:2005 spécifie les exigences applicables aux verres étalons pour l'étalonnage des frontofocomètres utilisés pour le mesurage des verres de lunettes.
Optika in optični instrumenti - Preskusne leče za umerjanje fokometrov – 1. del: Preskusne leče za fokometre, ki se uporabljajo za merjenje spektralnih leč (ISO 9342-1:2005)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2005
1DGRPHãþD
SIST EN ISO 9342:2000
2SWLNDLQRSWLþQLLQVWUXPHQWL3UHVNXVQHOHþH]DXPHUMDQMHIRNRPHWURY±GHO
3UHVNXVQHOHþH]DIRNRPHWUHNLVHXSRUDEOMDMR]DPHUMHQMHVSHNWUDOQLKOHþ ,62
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)
Optik und optische Instrumente - Prüfgläser zur Kalibrierung von Scheitelbrechwert-
Messgeräten - Teil 1: Prüfgläser für Scheitelbrechwert-Messgeräte für die Messung von
Brillengläsern (ISO 9342-1:2005)
Optique et instruments d'optique - Verres étalons pour l'étalonnage des frontofocometres
- Partie 1: Verres étalons pour frontofocometres pour le mesurage des verres de lunettes
(ISO 9342-1:2005)
Ta slovenski standard je istoveten z: EN ISO 9342-1:2005
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 9342-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 11.040.70 Supersedes EN ISO 9342:1998
English version
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)
Optique et instruments d'optique - Verres étalons pour Optik und optische Instrumente - Prüfgläser zur
l'étalonnage des frontofocomètres - Partie 1: Verres Kalibrierung von Scheitelbrechwert-Messgeräten - Teil 1:
étalons pour frontofocomètres pour le mesurage des verres Prüfgläser für Scheitelbrechwert-Messgeräte für die
de lunettes (ISO 9342-1:2005) Messung von Brillengläsern (ISO 9342-1:2005)
This European Standard was approved by CEN on 4 April 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9342-1:2005: E
worldwide for CEN national Members.
Foreword
This document (EN ISO 9342-1:2005) has been prepared by Technical Committee ISO/TC 172
"Optics and optical instruments" 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 November 2005, and conflicting national
standards shall be withdrawn at the latest by November 2005.
This document supersedes EN ISO 9342:1998.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 9342-1:2005 has been approved by CEN as EN ISO 9342-1:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 9342-1
First edition
2005-05-01
Optics and optical instruments — Test
lenses for calibration of focimeters —
Part 1:
Test lenses for focimeters used for
measuring spectacle lenses
Optique et instruments d'optique — Verres étalons pour l'étalonnage
des frontofocomètres —
Partie 1: Verres étalons pour frontofocomètres pour le mesurage des
verres de lunettes
Reference number
ISO 9342-1:2005(E)
©
ISO 2005
ISO 9342-1:2005(E)
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ii © ISO 2005 – All rights reserved
ISO 9342-1:2005(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 9342-1 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 7,
Ophthalmic optics and instruments.
This first edition cancels and replaces ISO 9342:1996, of which Clause 1 and Clauses A.5 to A.7 have been
technically revised.
ISO 9342 consists of the following parts, under the general title Optics and optical instruments — Test lenses
for calibration of focimeters:
Part 1: Test lenses for focimeters used for measuring spectacle lenses
Part 2: Test lenses for focimeters used for measuring contact lenses
INTERNATIONAL STANDARD ISO 9342-1:2005(E)
Optics and optical instruments — Test lenses for calibration of
focimeters —
Part 1:
Test lenses for focimeters used for measuring spectacle lenses
1 Scope
This part of ISO 9342 specifies requirements for test lenses for the calibration of focimeters that are used for
the measurement of spectacle form lenses.
NOTE It is accepted that other test lenses can also be used with powers within the given range, manufactured to the
same standard of accuracy and form, but different back vertex powers. However, only lenses with integer nominal powers,
as described in Annex A, can be used for the calibration of digitally-rounding focimeters.
2 Normative references
The following referenced 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.
ISO 7944, Optics and optical instruments — Reference wavelengths
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
spherical test lenses
lenses used for the calibration of the dioptric power measurements by focimeters, in which the power of each
lens is expressed as its back vertex power in dioptres (D)
3.2
prismatic test lenses
lenses used for the calibration of the prismatic deviation measurements by focimeters, in which the prismatic
power of each lens is expressed in centimetres deviation per metre distance (cm/m)
NOTE The special name for the unit for expressing prismatic power is the “prism dioptre” for which the symbol “∆” is
used.
3.3
cylindrical test lenses
lenses with cylindrical faces which are used to calibrate the axis marker and axis indicator with respect to the
adjustment orientation of the rail
NOTE These lenses are usually specially designed and marked.
ISO 9342-1:2005(E)
3.4
reference wavelength
wavelengths specified in ISO 7944
NOTE For the purposes of this part of ISO 9342, the reference wavelengths are either the green mercury e-line
(λ = 546,07 nm) or the yellow helium d-line (λ = 587,56 nm).
e d
4 Design requirements and recommendations for test lenses
4.1 General
Test lenses shall be made of homogeneous white crown glass with a refractive index n = 1,523 ± 0,002, or
d
n = 1,525 ± 0,002 selected to be free of bubbles and striae in an area of 4 mm radius surrounding the centre
e
of the free aperture.
The reference wavelength for which the test lenses are calibrated should be stated.
Test lenses should have a protective mount, which is designed so that, when the lens is correctly placed on
the lens support, the focimeter is not obstructed.
4.2 Spherical test lenses
For a complete set of spherical test lenses the following set of back vertex powers is recommended:
− 25 D, − 20 D, − 15 D, − 10 D, − 5 D, + 5 D, + 10 D, + 15 D, + 20 D, + 25 D
Spherical test lenses should have a free aperture of at least 15 mm.
In order to minimize the influence of spherical aberration, the curvature of the back surface and the centre
thickness shall approximately correspond to those of common spectacle lenses. Table 1 gives nominal back
surface powers and ranges for centre thickness, which will ensure that the lenses are of this form.
Table 1 — Design range for the standard test lenses
Nominal back vertex Nominal back surface Power range for BSP Range for centre
a
power BVP power BSP
thickness
−1 −1 −1
m (D) m (D) m (D) mm
2 to 6
−25 −25
2 to 6
−20 −20
2 to 6
−15 −15
2 to 8
−10 −12
2 to 8
−5 −9
± 1
+5 −5 3 to 7
+10
−3 3 to 7
+15
−1
5 to 7
+20
7 to 9
+25
9 to 11
NOTE Surface power is defined by the equation:
surface power = (refractive index −1) / radius of curvature in metres
a
The centre thicknesses are required to guarantee stability in the negative power range.
2 © ISO 2005 – All rights reserved
ISO 9342-1:2005(E)
4.3 Prismatic test lenses
The optical surfaces of prismatic test lenses shall be planar.
The number of prismatic test lenses that should be used to adjust or to check a focimeter depends on the
measuring range of the instrument. If a test lens is used, it shall meet the requirements of this part of
ISO 9342.
For a complete set, the following set of prismatic deviations is recommended:
2 ∆ 5 ∆ 10 ∆ 15 ∆ 20 ∆
4.4 Cylindrical test lenses
The test lens shall be a rectangular positive plano-cylinder of at least 5 D and shall have the dimensions
shown in Figure 1. The cylinder axis shall be parallel to the longer side of the rectangle and shall be marked
by a centreline. One of the longer sides shall be marked as the reference side.
Dimensions in millimetres
Key
1 centreline
Figure 1 — Cylindrical test lens
5 Tolerances
5.1 Tolerances for spherical test lenses
The permissible tolerances for spherical test lenses are specified in Table 2.
NOTE In Annex A an example is given for the proper design of test lenses that meet the requirements of Tables 1
and 2 for free apertures of up to 9 mm diameter.
ISO 9342-1:2005(E)
Table 2 — Tolerances for spherical test lenses
Nominal back vertex power Tolerance (maximum deviation)
−1 −1
m (D) m (D)
−25 0,03
0,02
−20
0,02
−15
0,01
−10
0,01
−5
0,01
+5
0,02
+10
0,02
+15
0,03
+20
0,03
+25
5.2 Tolerances for prismatic test lenses
The free aperture of prismatic test lenses shall be at least 15 mm. The tolerances shall not exceed the values
given in Table 3.
Table 3 — Tolerances for prismatic test lenses
Prismatic deviation Tolerance
cm/m (∆) cm/m (∆)
2 ± 0,02
± 0,03
± 0,05
± 0,10
± 0,15
5.3 Tolerances for cylindrical test lenses
The angular deviation between the cylinder axis and the longer side of the rectangle (see Figure 1) shall not
...
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