EN ISO 12870:1997
(Main)Ophthalmic optics - Spectacle frames - General requirements and test methods (ISO 12870:1997)
Ophthalmic optics - Spectacle frames - General requirements and test methods (ISO 12870:1997)
This International Standard specifies general requirements for unglazed spectacle frames designed for use with all prescription lenses, including tinted and untinted lenses, and is applicable to frames at the point of sale to the retailer. It is applicable to all frame types, including rimless mounts, semi-rimless mounts, folding spectacle frames and spectacle frames made from natural organic materials (...). NOTE See annex A for recommandations on the design of spectacle frames. This Standard is not applicable to products designed specifically to provide personal eye protection.
Augenoptik - Brillenfassungen - Allgemeine Anforderungen und Prüfverfahren (ISO 12870:1997)
Diese Internationale Norm legt allgemeine Anforderungen für unverglaste Brillenfassungen fest, die zur Verwendung mit allen Korrektionsgläsern einschließlich gefärbter und ungefärbter Gläser bestimmt sind. Sie ist zum Zeitpunkt des Verkaufs der Brillenfassung an den Wiederverkäufer gültig. Sie gilt für alle Brillenfasssungsarten, einschließlich randloser, halb-randloser, zusammenklappbarer Brillenfassungen und Brillenfassungen aus natürlichen organischen Materialien.
Optique ophtalmique - Montures de lunettes - Exigences générales et méthodes d'essai (ISO 12870:1997)
Očesna optika - Okviri očal - Splošne zahteve in preskusne metode (ISO 12870:1997)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 12870:2000
01-januar-2000
2þHVQDRSWLND2NYLULRþDO6SORãQH]DKWHYHLQSUHVNXVQHPHWRGH ,62
Ophthalmic optics - Spectacle frames - General requirements and test methods (ISO
12870:1997)
Augenoptik - Brillenfassungen - Allgemeine Anforderungen und Prüfverfahren (ISO
12870:1997)
Optique ophtalmique - Montures de lunettes - Exigences générales et méthodes d'essai
(ISO 12870:1997)
Ta slovenski standard je istoveten z: EN ISO 12870:1997
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
SIST EN ISO 12870:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 12870:2000
INTERNATIONAL ISO
STANDARD 12870
First edition
1997-12-15
Ophthalmic optics — Spectacle frames —
General requirements and test methods
Optique ophtalmique — Montures de lunettes — Exigences essentielles et
méthodes d'essai
A
Reference number
ISO 12870:1997(E)
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ISO 12870:1997(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.
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 12870 was prepared by Technical Committee
ISO/TC172 Optics and optical instruments, Subcommittee SC 7
Ophthalmic optics and instruments.
Annex A of this International Standard is for information only.
© ISO 1997
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 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
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INTERNATIONAL STANDARD ISO ISO 12870:1997(E)
Ophthalmic optics — Spectacle frames — General requirements
and test methods
1 Scope
This International Standard specifies general requirements for unglazed spectacle frames designed for use with all
prescription lenses, including tinted and untinted lenses, and is applicable to frames at the point of sale to the
retailer.
It is applicable to all spectacle frame types, including rimless mounts, semi-rimless mounts, folding spectacle frames
and spectacle frames made from natural organic materials (see 4.1).
NOTE See annex A for recommendations on the design of spectacle frames.
This International Standard is not applicable to products designed specifically to provide personal eye protection.
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 105-B02:1994, Textiles - Tests for colour fastness - Part B02: Colour fastness to artificial light: Xenon arc
fading lamp test.
ISO 3696:1987, Water for analytical laboratory use - Specification and test methods.
ISO 7998:1984, Optics and optical instruments - Spectacle frames - Vocabulary and lists of equivalent terms.
ISO 8596:1994, Ophthalmic optics - Visual acuity testing - Standard optotype and its presentation.
ISO 8624:1991, Optics and optical instruments - Ophthalmic optics - Measuring system for spectacle frames.
ISO 9456:1991, Optics and optical instruments - Ophthalmic optics - Marking of spectacle frames.
ISO 11380:1994, Optics and optical instruments - Ophthalmic optics - Formers.
ISO 11381:1994, Optics and optical instruments - Ophthalmic optics - Screw threads.
1)
ISO 11715:– , Ophthalmic optics - Format of digital files for data transfer for profiling of spectacle lenses.
1) To be published.
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3 Definitions
For the purposes of this International Standard, the definitions given in ISO 7998 and the following definitions apply.
3.1 spectacle frame model: Spectacle frame produced to a common design, using the same materials (but not
necessarily the same pigmentation) and surface treatment.
3.2 natural organic material: Material which has not been synthesized from other raw materials and, when
processed, remains essentially in its original state.
NOTES
1 Processing in this case is defined as cutting, shaping, bending, polishing and heating.
2 Examples of natural organic materials are natural shell and wood.
4 Requirements
4.1 General
All spectacle frame types shall comply with the requirements identified as general (see tables 1 and 2), although
other requirements are specific for certain spectacle frame types.
Table 1 — Requirements applicable to spectacle frames made from natural organic materials
Subclause
Frame type 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10
(*) (*) (*) (*)
Natural + 00+ 0 0 + 0 +
organic
materials
(*) These subclauses give general requirements
+ spectacle frame type shall comply with this subclause
0 compliance with this subclause is optional
4.2 Physiological compatibility
4.3 Measurement system
4.4 Dimensional tolerances
4.5 Tolerance on screw threads
4.6 Dimensional stability at elevated temperature
4.7 Mechanical stability
4.8 Resistance to perspiration
4.9 Resistance to optical radiation
4.10 Resistance to ignition
2
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Table 2 — Requirements applicable to spectacle frames made from all other materials
Subclause
Frame type 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10
(*) (*) (*) (*)
Rimless +0 0 + + 0 +++
mounts
Semi-rimless+0 0 + + 0 +++
mounts
Folding +++++ 0 +++
spectacle
frames
All other +++++ ++++
frames
(*) These subclauses give general requirements
+ spectacle frame type shall comply with this subclause
0 compliance with this subclause is optional
4.2 Physiological compatibility
4.3 Measurement system
4.4 Dimensional tolerances
4.5 Tolerance on screw threads
4.6 Dimensional stability at elevated temperature
4.7 Mechanical stability
4.8 Resistance to perspiration
4.9 Resistance to optical radiation
4.10 Resistance to ignition
4.2 Physiological compatibility
The manufacturer shall exclude from spectacle frames any materials that are known to cause irritation, allergic or
toxic reaction during wear in contact with the skin in a normal state of health, or during adjustment, amongst a
significant proportion of users.
NOTE Rare or idiosyncratic reaction to any material may occur and may indicate the need for the individual
to avoid particular types of material. Adverse skin reaction may be due to other causes, e.g. excessive
contact pressure.
4.3 Measurement system
The stated nominal dimensions of the spectacle frame shall be in accordance with the measuring system specified
in ISO 8624.
4.4 Dimensional tolerances
When measured with a linear measuring device having an accuracy of better than 0,1 mm, the following tolerances
shall apply to the marked dimensions of the unglazed spectacle frame:
a ) horizontal boxed lens size: ± 0,5 mm;
b) distance between lenses: ± 0,5 mm;
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c) bridge width: ± 0,5 mm;
d) overall length of side: ± 2,0 mm.
The lens aperture shall be deemed to have the correct dimensions if the spectacle frame, when fitted with a lens
machined using the appropriate former or geometrical data in compliance with the tolerance stipulated in 6.1,
displays no change in the fit of the test lens subsequent to the test specified in 8.3.
4.5 Tolerance on screw threads
The tolerances on the screw threads used in the spectacle frame shall conform to ISO 11381.
4.6 Dimensional stability at elevated temperature
When the spectacle frame with test lenses fitted is tested in accordance with 8.2, the dimensions shall not alter by
more than +6 mm or -12 mm. For small spectacle frames where the tip of the side is less than 100 mm from the
back plane of the front, these tolerances are reduced to + 5 mm or - 10 mm.
4.7 Mechanical stability
4.7.1 Bridge deformation
When tested in accordance with 8.3, the spectacle frame with the test lenses fitted shall not
a) fracture at any point;
b) be permanently deformed from its original configuration by more than 2 % of the distance between the
geometric centres of the spectacle frame.
4.7.2 Lens retention characteristics
The spectacle frame shall be considered to demonstrate acceptable lens retention characteristics if, when tested as
described in 8.3, neither test lens is dislodged wholly or partially from its original location in the groove.
4.7.3 Endurance
When tested in accordance with 8.4, the spectacle frame with the test lenses fitted shall not
a) fracture at any point;
b) be permanently deformed from its original shape by more than 5 mm after 500 cycles;
c) require more than light finger pressure to open and close the sides.
NOTE A side should not close under its own weight at any point in the opening/closing cycle.
Item c) shall not apply to sides fitted with sprung joints.
4.8 Resistance to perspiration
When the spectacle frame is tested in accordance with 8.5, there shall be no
a) spotting or colour change after testing for 8 h; or
b) corrosion, surface degradation or separation of any coating layer
which is visible, without magnification, on the parts liable to come in contact with the skin during wear, under the
inspection conditions described in 7.3.
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4.9 Resistance to optical radiation
When the spectacle frame is tested in accordance with 8.6, there shall be no
a) colour change; or
b) loss of lustre on bright surfaces
when compared with an untested sample under the inspection conditions described in 7.3.
4.10 Resistance to ignition
When the spectacle frame is tested in accordance with 8.7, there shall be no continued combustion after withdrawal
of the test rod.
5 Selection of specimens
The minimum level of conformity testing requires that two test specimens of each spectacle frame model be
selected by an established random sampling technique. These specimens shall be identified as sample 1 and
sample 2, and shall be conditioned as described in clause 6 before testing as described in clauses 7 and 8.
For the purposes of this International Standard, the spectacle frame model shall be deemed to have changed when
the design, material or surface treatment has changed.
6 Preparation and conditioning
6.1 Test lenses
Prior to testing, both samples shall be fitted with a pair of special test lenses made of silicate glass with a vertex
power of 0,00 D ± 0,25 D, a centre thickness of 2,25 mm ± 0,25 mm and a radius of curvature of the concave
surface of 120 mm ± 20 mm. The test lenses shall be edged in accordance with either the former complying with
ISO 11380 or the digital data complying with ISO 11715 supplied by the manufacturer of the spectacle frame to be
+
3
tested. The bevel angle of the edged lens shall be ()° for spectacle frames featuring a rim with a groove.
120
-2
When measured on every straight line through the boxed centre, the edged test lens shall not differ from the former
or the digital data by more than 0,1 mm.
6.2 Sample conditioning and test conditions
Immediately before starting the series of tests, condition the test specimens, as-received from the manufacturer or
supplier, for at least 4 h in an atmosphere maintained at a temperature of 23 °C ± 5 °C and a relative humidity of
50 % ± 10 %.
Carry out the testing in an atmosphere maintained within the same temperature and humidity ranges.
7 Testing, inspection and compliance
7.1 State of samples
Test the conditioned test specimens (6.2) as-received from the manufacturer or supplier, without prior realignment
or adjustment.
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7.2 Sequence of testing
Carry out the testing in the sequence specified in table 3. After completion of the endurance test, cut sample 2 in
half at the bridge. Subject either half of the spectacle frame to the test for resistance to optical radiation (8.6), with
the other half acting as a control for colour comparison purposes.
NOTE If a range of spectacle frame models is made from the same material(s) and with the same manufacturing
procedures, it is acceptable to perform test sequences 6, 7 and 8 on only one of the spectacle frame models.
Table 3 — Sequence of testing
Identification of test Require- Test Sequence Sample 1 Sample 2
ment method
clause clause
Dimensional tolerance 4.3; 4.4 1 *
Dimensional stability 4.6 8.2 2 *
Bridge deformation 4.7.1 8.3 3 *
Lens retention 4.7.2 8.3 4 *
Endurance 4.7.3 8.4 4 *
Resistance to perspiration 4.8 8.5 6 *
Resistance to optical radiation 4.9 8.6 7 *
Resistance to ignition 4.10 8.7 8 *
* Indicates the test shall be applied
7.3 Inspection and examination
The inspection and examination of test samples shall be carried out, without the aid of a magnifying lens, by an
observer with a visual acuity of at least 1,0, when tested using optotypes conforming to ISO 8596. Any required
visual correction shall be worn for the observation distance.
During the examination, expose the test specimen to an illuminance of 1000 lx to 2000 lx and carry out the
inspection against a matt black background.
7.4 Compliance
If both specimens of the spectacle frame model pass the tests as required in tables 1 and 2 selected from those
specified in table 3, the product shall be deemed to comply with this International Standard.
If one specimen fails any test, a second set of two shall be tested. If both pass the tests as required in tables 1 and
2, the product shall be deemed to comply with this International Standard. If one or more tests in the sequence
result in failure, the product shall be deemed not to comply with this International Standard. If two or more of the
tests carried out on the first set of specimens result in failure, no second set shall be tested and the product shall be
deemed not to comply with this International Standard.
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8 Test methods
8.1 General
The test methods described are reference test methods. Variations or alternatives may be used provided that their
results can be shown to be equivalent to those of the relevant reference method. In cases of dispute, the result
obtained with the reference method shall have precedence.
8.2 Test for dimensional stability at elevated temperature
8.2.1 Apparatus
8.2.1.1 Test apparatus, consisting of a non-hermetic heating chamber with a temperature range from not less
than ambient to 160 °C and fitted with a thermostat capable of controlling the temperature of the chamber to a
tolerance of 3 °C.
8.2.1.2 Flat polished plate, of glass or metal, mounted in the chamber (8.2.1.1) either on, or parallel to, the base
of the chamber.
8.2.1.3 Linear measuring device, having a measuring accuracy of better than 0,5 mm.
8.2.2 Procedure
8.2.2.1 In ambient conditions of 23 °C ± 5 °C, take the test specimen, with test lenses fitted and with the sides
open to the fullest extent, and measure the distance between the side tips using the measuring device (8.2.1.3).
Record this measurement as the pre-heating dimension, l .
o
8.2.2.2 Before commencing the test, stabilize the
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