1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistantThe Europe
2、an Standard EN ISO 8980-5:2005 has the status of a British StandardICS 11.040.70Ophthalmic optics Uncut finished spectacle lenses BRITISH STANDARDBS EN ISO 8980-5:2005BS EN ISO 8980-5:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 Jan
3、uary 2006 BSI 23 January 2006ISBN 0 580 47119 5The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of t
4、he BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary
5、of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 8, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the docume
6、nt was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesenquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related inte
7、rnational and European developments and promulgate them in the UK.National forewordThis British Standard is the official English language version of EN ISO 8980-5:2005. It is identical with ISO 8980-5:2005.The UK participation in its preparation was entrusted to Technical Committee CH/172/3, Spectac
8、les, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 8980-5August 2005ICS 11.040.70English VersionOphthalmic optics - Uncut finished spectacle lenses - Part 5:
9、Minimum requirements for spectacle lens surfaces claimed to beabrasion-resistant (ISO 8980-5:2005)Optique ophtalmique - Verres de lunettes finis non dtours- Partie 5: Exigences minimales pour les surfaces de verresde lunettes dclares tre rsistantes labrasion (ISO8980-5:2005)Augenoptik - Rohkantige f
10、ertige Brillenglser - Teil 5:Mindestanforderungen an die Oberflchen abriebfesterBrillenglser (ISO 8980-5:2005)This European Standard was approved by CEN on 22 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanSt
11、andard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French,
12、 German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, D
13、enmark, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPI
14、SCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 8980-5:2005: EForeword This document (EN ISO 8980-5:2005) has been prepared by Technical Committe
15、e 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 t
16、he latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006. 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
17、, 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 8980-5:2005 has b
18、een approved by CEN as EN ISO 8980-5:2005 without any modifications. EN ISO 8980-5:2005Reference numberISO 8980-5:2005(E)INTERNATIONAL STANDARD ISO8980-5First edition2005-08-01Ophthalmic optics Uncut finished spectacle lenses Part 5: Minimum requirements for spectacle lens surfaces claimed to be abr
19、asion-resistantOptique ophtalmique Verres de lunettes finis non dtours Partie 5: Exigences minimales pour les surfaces de verres de lunettes dclares tre rsistantes labrasion EN ISO 8980-5:2005ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of nationa
20、l 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. Internation
21、al 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
22、 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 le
23、ast 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 8980-5 was prepared by Technical Committee ISO/TC 1
24、72, Optics and photonics, Subcommittee SC 7, Ophthalmic optics and instruments. ISO 8980 consists of the following parts, under the general title Ophthalmic optics Uncut finished spectacle lenses: Part 1: Specifications for single-vision and multifocal lenses Part 2: Specifications for progressive p
25、ower lenses Part 3: Transmittance specifications and test methods Part 4: Specifications and test methods for anti-reflective coatings Part 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistant EN ISO 8980-5:2005blank1Ophthalmic optics Uncut finished spectacle lenses P
26、art 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistant 1 Scope This part of ISO 8980 specifies the requirement and test method for spectacle lens surfaces that are claimed to provide a basic level of abrasion resistance including those with coatings. A lens claimed
27、to be abrasion-resistant shall meet the requirements on both front and back surfaces. Lens powers and surface form is restricted for testing, however test results are applicable to claims for lenses and lens surfaces with identical properties other than the lens power or surface radius. This part of
28、 ISO 8980 does not attempt to define the properties of lens surfaces with abrasion resistance better than the following defined criteria. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited app
29、lies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 13666, Ophthalmic optics Spectacle lenses Vocabulary ISO 8980-4, Ophthalmi
30、c optics Uncut finished spectacle lenses Part 4: Specifications and test methods for anti-reflective coatings 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 13666 and in ISO 8980-4 and the following apply. 3.1 abrasion resistance property of a spect
31、acle lens surface to resist damage during normal use such as scratches caused by cleaning or wear EN ISO 8980-5:20052 4 Requirement Under the conditions described in the test method given in Clause 5, the surface tested shall be free of visible abrasion. When used as a type test, 10 consecutively te
32、sted surfaces shall be free of visible abrasion. 5 Test method 5.1 Materials and equipment 5.1.1 Abrasion tool The abrasion tool1)allows the controlled positioning and movement of an eraser covered with cheesecloth against the test surface. The abrasion tool is calibrated to apply a force of (5 1) N
33、. (A model of an abrasion tool is shown in Annex A.) 5.1.2 Eraser The eraser1)(see Annex A) shall be a uniform mixture of rubber and abrasive, formed by an extrusion process. It shall be composed of no less than 15 % by mass of pumice. All abrasive shall be fine-ground, such that 100 % will pass thr
34、ough a sieve with opening 45 m. The formulation shall not contain any ingredient that might leave a residue on the surface under test that would lubricate subsequent strokes during the test procedure. The finished eraser shall have an international rubber hardness degree (IRHD) in accordance with IS
35、O 48 of 75 5 on both ends. The diameter of the eraser shall be from 6,5 mm to 7 mm with a usable flat surface of no less than 5,5 mm. It shall be of sufficient length so as to be held securely in the abrasion tester with no more than 3 mm exposed. The eraser shall be free from any excessive holes, c
36、racks, splits, or foreign particles, which might adversely affect its use. In order to maintain specified hardness, the eraser shall periodically be checked and replaced as required. 5.1.3 Cotton cheesecloth The cheesecloth1)(see Annex A) shall be unbleached, the warp shall have 41 yarns to 47 yarns
37、 per 25 mm, and the weft shall have 33 yarns to 39 yarns per 25 mm. The total number of yarns in a 25 mm by 25 mm square shall be 76 to 84. 5.1.4 Lens and surface form The lenses to be tested shall have an optical power between 3,00 D and +3,00 D. The tested surface shall have a numerical radius of
38、curvature no less than 75 mm. 1) Abrasion tool, cheesecloth and eraser manufactured to the requirements in 5.1 may be available from: Summers Optical 321 Morris Road P.O. Box 162 Fort Washington, PA 19034 USA phone (215) 646 1477 fax (215) 646 8931 e-mail http:/ This information is given for the co
39、nvenience of users of this part of ISO 8980 and does not constitute an endorsement by ISO of this supplier. EN ISO 8980-5:200535.1.5 Inspection lighting Use a fluorescent light source of at least 400 lm, which, for example can be achieved by one fluorescent tube of 15 W or a set of two fluorescent t
40、ubes of 8 W each. The light source and specimen shall be configured as shown in Figure 1 and Figure 2. Inspect the lens in a room with ambient lighting of about 200 lx. Dimensions in millimetres Key 1 observer 2 commercial fixture containing light source 3 matt black background 4 specimen Figure 1 R
41、eflection inspection EN ISO 8980-5:20054 Dimensions in millimetres Key 1 observer 2 commercial fixture containing light source 3 matt black background 4 specimen Figure 2 Side illumination inspection 5.2 Preparation 5.2.1 Test site Clean the test site and surrounding area, including all potential so
42、urces of particulate contamination. Verification of the test site is required as described in Annex B at any time that a lens surface fails the requirements. The environment of the test site shall be (23 5) C and (50 20) % RH (relative humidity). 5.2.2 Lens samples Before subjecting a lens surface t
43、o any inspection or test, the specimen shall be thoroughly cleaned to remove dirt, finger marks, smears, etc. The lens surface shall be inspected to ensure that it is free from any visible surface abrasion or contamination. 5.2.3 Abrasion tool Fold the cheesecloth to create 12 layers, and then attac
44、h it to the tool as shown in Figure 3. Secure with a clamp. Ensure that the travel of the plunger is not restricted. EN ISO 8980-5:20055Dimensions in millimetres a) 1 layer b) Folding c) 3 layers d) 6 layers e) Finished 12 layers f) Attachment of cheesecloth to eraser Figure 3 Cheesecloth and tool a
45、ssembly 5.3 Procedure Rub the lens surface with the prepared tool applying the force of (5 1) N for 25 cycles. A cycle is defined as one stroke in one direction, followed by a return stroke in the opposite direction. A stroke is defined as one pass in one direction on the surface being tested. The c
46、entre of the abrasion track shall pass within 2 mm of the geometric centre, with a stroke length of (30 5) mm. The test shall be conducted at a rate of (1 0,1) cycle per second. The lens sample shall be held firmly so that it does not move during the test. The tool shall follow the curvature of the
47、lens during the rubbing operation to within 5 of the normal to the surface under test. Inspect the lens surface tested by reflection and side illumination as described in Figures 1 and 2 for any visible scratches. If visible scratches are observed, refer to 5.2. The use of mechanization can make it
48、easier to perform the test (see Annex C). EN ISO 8980-5:20056 Annex A (informative) Model of an abrasion tool and components The plunger, which can move longitudinally within the body of the tool, is fitted at one end with a chuck holding an eraser wrapped in cheesecloth, while the other end carries
49、 a scale or other marking indicating the position of the plunger within the body. The plunger is loaded by a spring to apply a force of (5 1) N when the body is held vertically to the specimen surface and the scale marking is in its required position. Key 1 indicator rod 2 plunger 3 chuck 4 eraser 5 body 6 cap Figure A.1 Model of an abrasion tool EN ISO 8980-5:20057Annex B (normative) Verification of test conditions The re
