EN ISO 9914:1996

Optics and optical instruments - Contact lenses - Determination of refractive index of contact lens materials (ISO 9914:1995)

Specification of a uniform test procedure in order to achieve comparable test results.

Optik und optische Instrumente - Kontaktlinsen - Bestimmung der Brechzahl von Kontaktlinsenmaterialien (ISO 9914:1995)

Diese Internationale Norm legt ein Prüfverfahren zur Bestimmung der Brechzahl von Kontaktlinsenmaterialien fest. Das beschriebene Prüfverfahren wird als Referenzverfahren angegeben. Alternative Verfahren dürfen verwendet werden, vorausgesetzt, daß Wiederholbarkeit und Genauigkeit der Brechzahl des Probenkörpers in der Prüfung der hier festgelegten mindestens gleichwertig nach ISO 5725 sind.

Optique et instruments d'optique - Lentilles de contact - Détermination de l'indice de réfraction des matériaux des lentilles de contact (ISO 9914:1995)

Optika in optični instrumenti - Kontaktne leče - Ugotavljanje lomnega količnika materialov za kontaktne leče (ISO 9914:1995)

General Information

• Status: Withdrawn
• Publication Date: 22-Oct-1996
• Withdrawal Date: 14-Aug-2006
• ICS: 11.040 - Medical equipment
• Technical Committee: CEN/TC 170 - Ophthalmic optics
• Drafting Committee: CEN/TC 170/WG 4 - Contact lenses I
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 15-Aug-2006
• Completion Date: 15-Aug-2006
• Ref Project: SIST EN ISO 9914:2000 - Optics and optical instruments - Contact lenses - Determination of refractive index of contact lens materials (ISO 9914:1995)

Relations

• Replaced By: EN ISO 18369-4:2006 - Ophthalmic optics - Contact lenses - Part 4: Physicochemical properties of contact lens materials (ISO 18369-4:2006)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 9914:2000
01-januar-2000
2SWLNDLQRSWLþQLLQVWUXPHQWL.RQWDNWQHOHþH8JRWDYOMDQMHORPQHJDNROLþQLND
PDWHULDORY]DNRQWDNWQHOHþH,62
Optics and optical instruments - Contact lenses - Determination of refractive index of
contact lens materials (ISO 9914:1995)
Optik und optische Instrumente - Kontaktlinsen - Bestimmung der Brechzahl von
Kontaktlinsenmaterialien (ISO 9914:1995)
Optique et instruments d'optique - Lentilles de contact - Détermination de l'indice de
réfraction des matériaux des lentilles de contact (ISO 9914:1995)
Ta slovenski standard je istoveten z: EN ISO 9914:1996
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 9914:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9914:2000

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SIST EN ISO 9914:2000

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SIST EN ISO 9914:2000

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SIST EN ISO 9914:2000

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SIST EN ISO 9914:2000

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SIST EN ISO 9914:2000
INTERNATIONAL
IS0
STANDARD
9914
First edition
1995-l 2-01
Optics and optical instruments - Contact
lenses - Determination of refractive index
of contact lens materials
Op tique et hstrumen ts d’optique - Len tiles de con tact -
D&ermination de I’indice de r&fraction des mathaux des /en tiles de
contact
Reference number
IS0 9914:1995(E)

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SIST EN ISO 9914:2000
IS0 9914:1995(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(I 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 IS0 9914 was prepared by Technical Committee
lSO/TC 172, Optics and optica/ instruments, Subcommittee SC 7,
Ophthalmic optics and instruments.
0 IS0 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland

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SIST EN ISO 9914:2000
IS0 9914:1995(E)
INTERNATIONAL STANDARD 0 ISO
Optics and optical instruments - Contact lenses -
Determination of refractive index of contact lens
materials
3 Definitions
1 Scope
For the purposes of this International Standard the
This International Standard specifies a test method for
definitions given in IS0 8320 and the following defi-
determining the refractive index of contact lens ma-
nition apply.
terials. The test method described is given as a ref-
erence method. Alternative methods may be used
3.1 refractive index (of a contact lens material):
provided that repeatability and accuracy are at least
Ratio of the sine of the angle of incidence to the sine
equal to those specified herein for the refractive index
of the angle of refraction when a ray of light of de-
of the specimen under test according to IS0 5725’).
fined wavelength passes from air into the contact lens
material maintained at a constant temperature.
4 Principle
The refractive index is determined by measuring the
2 Normative references
angle at which total internal reflection occurs when
light passes from the prism surface of the refrac-
The following standards contain provisions which,
tometer into the contact lens material. It is necessary
through reference in this text, constitute provisions
to use a contacting fluid between the contact lens
of this International Standard. At the time of publi-
material and the refractometer prism for all materials
cation, the editions indicated were valid. All standards
except hydrogels.
are subject to revision, and parties to agreements
based on this International Standard are encouraged
to investigate the possibility of applying the most re- 5 Apparatus
cent editions of the standards indicated below.
Members of IEC and IS0 maintain registers of cur-
5.1 Abbe refractometer, or refractometer of similar
rently valid International Standards.
design, calibrated using one of the reference wave-
lengths specified in IS0 7944 and having a precision
IS0 7944:1984, Optics and optical instruments -
of at least + 0,000 5.
-
Reference wavelengths.
A refractometer calibrated for a wavelength other than
IS0 8320:1986, Optics and optical instruments -
the reference wavelength may be used only if an ac-
Con tact lenses - Vocabulary and symbols.
curate conversion to the desired wavelength is avail-
able.
IS0 10344:~-21, Optics and optical instruments -
Con tact lenses
- Saline solution for contact lens Refractometers designed to measure the solids con-
testing.
tent of sugar solutions may be used only if an accu-
I) IS0 5725:1994, Accuracy (trueness and precision) of measurement methods and results.
2) To be published.

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