EN ISO 10342:1999

SLOVENSKI STANDARD
01-januar-2000
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Ophthalmic instruments - Eye refractometers (ISO 10342:1997)
Ophthalmische Instrumente - Augenrefraktometer (ISO 10342:1997)
Instruments ophtalmiques - Réfractometres (ISO 10342:1997)
Ta slovenski standard je istoveten z: EN ISO 10342:1999
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 10342
First edition
1997-10-01
Ophthalmic instruments -
Eye ref ractometers -
Instruments ophtalmiques - ßkfractomefres
Reference number
ISO 10342: 1997(E)
EO 10342: 1997(E)
Foreword
ISO (the International Organization for Standardization) is a worldwidc
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 patt 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 10342 was prepared by ISO/TC 172, Optics
and Optical instruments, Subcommittee SC 7, Ophthalmic optics and
ins trumen ts.
Annex A forms an integral patt of this International Standard.
0 ISO 1997
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microfilm, without Permission in writing from the publisher.
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ii
ISO 10342:1997( E)
INTERNATIONAL STANDARD 0 ISO
Ophthalmic instruments - Eye refractometers
1 Scope
This International Standard, together with ISO 15004, specifies requirements and test
methods for eye refractometers.
This International Standard takes precedence over ISO 15004, if differentes exist.
2 Normative references
The following Standards contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the
editions indicated were valid. All Standards are subject to revision, and Parties to
agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the Standards indicated below.
Members of IEC and ISO maintain registers of currently valid International Standards.
)
ISO 7944: -1) Optics and Optical instruments - ßeference wavelengths.
ISO 8429: 1986, Optics and Optical instruments - Ophthalmology - Graduated dial scale.
ISO 13666: -2) , Ophthalmic optics - Spectacle lenses - Vocabulary.
-2) Ophthalmic instruments - General requirements and test methods.
ISO 15004: ,
IEC 601-1: 1988, Medical electrical equipment - Parf 1: General requirements for safety.
3 Definitions
For the purposes of this International Standard, the definitions given in ISO 13666 and
the following definition apply.
Instrument with continuous or digital readout used for
3.1 eye refractometer:
measuring the refractive errors of the eye.
4 Requirements
4.1 General
The eye refractometer shall conform to the general requirements specified in
ISO 15004.
1) To be published. (Revision of ISO 7944:1984)
2) To be published.
ISO 10342: 1997(E)
42 . Optical requirements
The eye refractometer shall conform to the requirements given in table l or table 2.
The dioptric powers indicated in the requirements shall be referenced to the
wavelengths h = 546,07 nm or h = 58756 nm as required in ISQ 7944.
If the requirements arc not met for both wavelengths, the reference wavelength used
shall be indicated.
The indication of the readings of cylinder power shall be possible in plus or minus
cylinder convention.
Table 1 - Requirements for continuously indicating eye refractometers
Accuracy -
Criterion Measuring range Maximum double
scale interval
Standard
deviation
Spherical and cylindrical 0,25 D
+ 0,25 D
vertex power
0,50 D
+ 0,50 D
Cylinder 0,25 D to 0,50 D
+ IO”
axis ‘)
for
’ 0,50 D to 3,00 D 0” to 180” 5
- + 5”
cylinder
power > 3,00 D
+ 3”
-
i
*) Cylinder axis shall be indicated as specified in ISO 8429.
Table 2 - Requirements for digitally indicating eye refractometers
Deviation from
Criterion Measuring range Maximum
the nominal
scale interval
value of the
test device
Spherical and cylindrical 0,OO D to i: IO,00 D
0,25 D 2 0,25 D
vertex power
> IO,00 D 0,50 D 2 0,50 D
(absolute)
Cylinder 0,25 D to 0,50 D
+ IO”
-
axis ‘)
for > 0,50 D to 3,00 D
0” to 180” 2 5”
1 0
cylinder
!
power 3,00 D
> + 3”
*) Cylinder axis shall be indicated as specified in ISO 8429.
@ ISO
ISO 10342:1997(E)
43 l Measuring range
The eye refractometer shall have a minimum measuring range for vertex power of -15 D
to +15 D.
Eye refractometers which indicate cylindrical power shall have a minimum measuring
range for cylinder power of 0 D to 6 D.
The eye refractometer shal
...