SIST EN ISO 8599:2000

SLOVENSKI STANDARD
SIST EN ISO 8599:2000
01-januar-2000
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Optics and optical instruments - Contact lenses - Determination of the spectral and
luminous transmittance (ISO 8599:1994)
Optik und optische Instrumente - Kontaktlinsen - Bestimmung des spektralen
Transmissionsgrades und des Lichttransmissionsgrades (ISO 8599:1994)
Optique et instruments d'optique - Lentilles de contact - Détermination du facteur
spectral de transmission et du facteur relatif de transmission dans le visible (ISO
8599:1994)
Ta slovenski standard je istoveten z: EN ISO 8599:1996
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 8599:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8599:2000

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SIST EN ISO 8599:2000

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SIST EN ISO 8599:2000

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SIST EN ISO 8599:2000
INTERNATIONAL
ISO
STANDARD
8599
First edition
19944 2-01
Optics and Optical instruments - Contact
lenses - Determination of the spectral
and luminous transmittance
Op tique et ins trumen ts d ’optique - Len tilles de con tact -
Determination du facteur spectral de transmission et du facteur relatif de
transmission dans Ie visible

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SIST EN ISO 8599:2000
ISO 8599: 1994(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bedies). 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 8599 was prepared by Technical Committee
lSO/TC 172, Optics and Optical instruments, Subcommittee SC 7,
Ophthalmic, endoscopic, metrological instruments and test methods.
Annex A of this International Standard is for information only.
0 ISO 1994
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 8599:2000
INTERNATIONAL STANDARD 0 ISO ISO 8599: 1994(E)
Optics and Optical instruments - Contact lenses -
Determination of the spectral and luminous
transmittance
d@
ez
1 Scope
=-
tD
eh
dA.
This International Standard specifies a method for
determining the spectral transmittance and the lumi- 3.2 luminous transmittance, Z: Ratio of the trans-
nous transmittance of contact lenses. mitted luminous flux, DT, to the incident luminous flux,
0:
@T
2 Normative reference =-
z
0)
The following Standard contains provisions which,
780 nm
through reference in this text, constitute provisions
(@eA)relz (A> Va> da
;1=380 nm
of this International Standard. At the time of publi-
=
. . .
(2)
780 nm
cation, the edition indicated was valid. All Standards
(@eAhelV(a) da
are subject to revision, and Parties to agreements
A=380 nm
based on this International Standard are encouraged
to investigate the possibility of applying the most re-
cent edition of the Standard indicated below. Mem- 4 Principle
bers of IEC and ISO maintain registers of currently
valid International Standards.
4.1 Spectral transmittance
ISO 8320:1986, Optics and optical instruments -
In practice, the measurement of the spectral
Contact lenses - Vocabulary and symbols.
transmittance, Z(A), is taken over a small range of
wavelength AA, for which the associated radiant flux
AOe is given by A@e = @,,AL. In Order to determine
3 Definitions
the spectral transmittance, z(L), the radiant flux rela-
tive to the wavelength both with and without the
For the purposes of this International Standard, the
contact lens is measured and z(A) calculated from
definitions given in ISO 832
...