1、Ophthalmic optics - Uncut finished spectacle lensesPart 2: Specifications for power-variation lenses (ISO 8980-2:2017)BS EN ISO 8980-2:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN ISO 8980-2
2、:2017. It supersedes BS EN ISO 8980-2:2004 , which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CH/172/3, Spectacles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to inc
3、lude all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 89526 5ICS 11.040.70Compliance with a British Standard cannot confer immunity from legal obligations.This B
4、ritish Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 8980-2:2017EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 8980-2August 2017ICS 11.040
5、.70 Supersedes EN ISO 8980-2:2004EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN Ref. No. EN ISO 8980-2:2017: EAll rights of exploitation in any form and by any means reserved
6、worldwide for CEN national MembersOphthalmic optics - Uncut finished spectacle lenses - Part 2: Specifications for power-variation lenses (ISO 8980-2:2017)Optique ophtalmique - Verres de lunettes finis non dtours - Partie 2: Spcifications pour les verres variation de puissance (ISO 8980-2:2017)Augen
7、optik - Rohkantige fertige Brillenglser - Teil 2: Anforderungen an Wirkungsvariationsglser (ISO 8980-2:2017)This European Standard was approved by CEN on 26 May 2017.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stan
8、dard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.This European Standard exists in three official versions (English
9、, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulg
10、aria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzer
11、land, Turkey and United Kingdom.English VersionEN ISO 8980-2:2017 (E)European forewordThis document (EN ISO 8980-2:2017) has been prepared by Technical Committee ISO/TC 172 “Optics and photonics“ in collaboration with Technical Committee CEN/TC 170 “Ophthalmic optics” the secretariat of which is hel
12、d 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 the latest by February 2018, and conflicting national standards shall be withdrawn at the latest by February 2018.Attention is drawn to the possibility t
13、hat some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes EN ISO 8980-2:2004 .According to the CEN-CENELEC Internal Regulations, the national standards organizations of the f
14、ollowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherland
15、s, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 8980-2:2017 has been approved by CEN as EN ISO 8980-2:2017 without any modification.2BS EN ISO 8980-2:2017ISO 8980-2:2017(E)Foreword iv1 Scope
16、 .12 Normative references 13 Terms and definitions .14 Classification 15 Requirements 25.1 Reference temperature 25.2 Optical requirements . 25.2.1 General 25.2.2 Back vertex power of power-variation lenses at the primary reference point 25.2.3 Direction of the cylinder axis 25.2.4 Variation power (
17、including addition power) 35.2.5 Prismatic power .35.2.6 Prism base setting 35.3 Requirements for size and thickness .45.4 Orientation requirement for polarizing lenses .46 Verification methods 46.1 General .46.2 Verification method for back vertex power46.3 Verification method for the direction of
18、the cylinder axis.56.4 Verification method for prismatic power.56.5 Verification method for variation power (including addition power) 56.5.1 General56.5.2 Procedure .56.6 Inspection method for material and surface quality 57 Marking 57.1 Permanent marking 57.2 Optional non-permanent marking .68 Ide
19、ntification and information 69 Reference to this document 6Annex A (informative) Material and surface quality7Bibliography 8 ISO 2017 All rights reserved iiiContents PageBS EN ISO 8980-2:2017ISO 8980-2:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation
20、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. I
21、nternational 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.The procedures used to develop this document and those
22、intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see
23、 www.iso.org/directives).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. Details of any patent rights identified during the development of the docume
24、nt will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the m
25、eaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html This document was prepared by Tech
26、nical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 7, Ophthalmic optics and instruments.This third edition cancels and replaces the second edition (ISO 8980-2:2004 ), which has been technically revised. It also incorporates the Technical Corrigendum ISO 8980-2:2004/Cor.1:2006.A list o
27、f all parts in the ISO 8980series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 8980-2:2017Ophthalmic optics - Uncut finished spectacle lenses Part : Specifications for power-variation lenses (ISO 8980-2:2017)1 ScopeThis document specifies requirements and verification met
28、hods for the optical and geometrical properties for uncut finished power-variation lenses.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited
29、applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 7944 , Optics and optical instruments Reference wavelengthsISO 8429 , Optics and optical instruments Ophthalmology Graduated dial scaleISO 8598-1 , Optics and optical instruments Foc
30、imeters Part 1: General purpose instrumentsISO 8980-3 , Ophthalmic optics Uncut finished spectacle lenses Part 3: Transmittance specifications and test methodsISO 13666 , Ophthalmic optics Spectacle lenses VocabularyISO 14889 , Ophthalmic optics Spectacle lenses Fundamental requirements for uncut fi
31、nished lensesISO 21987 , Ophthalmic optics Mounted spectacle lenses3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 13666 and ISO 21987 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Onlin
32、e browsing platform: available at http:/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/ 4 ClassificationUncut finished lenses are classified as follows:a) single-vision finished lenses;b) multifocal finished lenses;c) power-variation finished lenses.INTERNATIONAL STANDARD
33、ISO 8980-2:2017(E) ISO 2017 All rights reserved 1BS EN ISO 8980-2:2017ISO 8980-2:2017(E)5 Requirements5.1 Reference temperatureThe tolerances shall apply at a temperature of 23 C 5 C.5.2 Optical requirements5.2.1 GeneralThe optical characteristics shall be verified using a focimeter conforming to th
34、e requirements of ISO 8598-1 .The optical tolerances shall apply at the reference point(s) of the lens at one of the reference wavelengths specified in ISO 7944 .If the manufacturer states a verification power, then the ranges and tolerances in Table 1 to Table 4 shall be chosen according to and app
35、lied to the verification power. In this case, the verification power may be stated by the manufacturer on the package or in an accompanying document.5.2.2 Back vertex power of power-variation lenses at the primary reference pointWhen verified according to 5.2.1, spectacle lenses shall comply with th
36、e tolerances on the power of each principal meridian (see Table 1, second column), and with the tolerances on the cylindrical power(see Table 1, third to sixth column), using the method specified in 6.2.Table 1 Tolerances on the back vertex power of power-variation lensesValues in dioptres (D)Power
37、of principal meridian with higher absolute back vertex powerTolerance on the back vertex power of each principal meridianTolerance on the absolute cylindrical power0,00 and 0,75 0,75 and 4,00 4,00 and 6,00 6,000,00 and 6,00 0,12 0,12 0,18 0,18 0,256,00 and 9,00 0,18 0,18 0,18 0,18 0,259,00 and 12,00
38、 0,18 0,18 0,18 0,25 0,2512,00 and 20,00 0,25 0,18 0,25 0,25 0,2520,00 0,37 0,25 0,25 0,37 0,375.2.3 Direction of the cylinder axisWhen verified according to 5.2.1 and using the method specified in 6.3, the direction of the cylinder axis shall comply with the tolerances specified in Table 2. The cyl
39、inder axis shall be specified in accordance with ISO 8429 .NOTE There are no requirements for the axis direction for cylindrical power of less than 0,12 D.Table 2 Tolerances on the direction of the cylinder axisAbsolute cylindrical powerdioptres (D)0,25 and 0,500,50 and 0,750,75 and 1,501,50Toleranc
40、e on the direction of the cylinder axisdegrees ()No requirement14 7 5 3 22 ISO 2017 All rights reservedBS EN ISO 8980-2:2017ISO 8980-2:2017(E)5.2.4 Variation power (including addition power)When verified according to 5.2.1 using the method specified in 6.5, the variation (including addition) power s
41、hall comply with the tolerances specified in Table 3. The tolerance on the variation power for power-variation lenses applies only to lenses having primary and secondary reference points.Table 3 Tolerances on the variation power (including addition power)Values in dioptres (D)Value of the variation
42、power (including addition power)4,00 4,00Tolerance 0,12 0,185.2.5 Prismatic powerWhen verified according to 5.2.1 at the prism reference point and using the method specified in 6.4, the total prism (including ordered and thickness reduction prism) shall comply with the tolerance(s) given in Table 4.
43、 Lenses with no ordered prism are also included.To determine the prismatic power tolerances, find the value S of the higher absolute principal power. Then:a) if ordered as an oblique prism, resolve any ordered prism into its horizontal and vertical components;b) determine the horizontal prism tolera
44、nces in the row in Table 4 according to the total horizontal prism component using the second column;c) determine the vertical prism tolerances in the row in Table 4 according to the total vertical prism component using the third column.Table 4 Prismatic toleranceValues in prism dioptres ()Higher to
45、tal prism com-ponent valueHorizontal component Vertical component0,00 and 2,00 0,25 + (0,1 S) 0,25 + (0,05 S)2,00 and 10,00 0,37 + (0,1 S) 0,37 + (0,05 S)10,00 0,50 + (0,1 S) 0,50 + (0,05 S)NOTE 1 S is the focal power, in dioptres, in the meridian of higher absolute principal power.NOTE 2 (0,1 S) co
46、rresponds to the prismatic effect of 0,1 cm (1 mm) displacement, while (0,05 S) corresponds to the prismatic effect of 0,05 cm (0,5 mm) displacement.NOTE An example of applying the tolerances given in Table 4 to a distance power of +0,50 D sphere /2,50 D cylinder axis 20 in a progressive prescriptio
47、n with a prismatic power of not greater than 2,00 is as follows.For this prescription, the principal powers are +0,50 D and 2,00 D so that the higher absolute principal power is 2,00 D. For a power of 2,00 D, the horizontal tolerance is 0,25 + (0,1 2,00) = 0,45 . The vertical tolerance is 0,25 + (0,
48、05 2,00) = 0,35 .5.2.6 Prism base settingThe tolerances on the base setting of any prism shall be determined by verifying that the horizontal and vertical components comply with Table 4. ISO 2017 All rights reserved 3BS EN ISO 8980-2:2017ISO 8980-2:2017(E)5.3 Requirements for size and thicknessLens
49、sizes are classified as follows:a) nominal size (d n): dimension(s), in millimetres, indicated by the manufacturer;b) effective size (d e): actual dimension(s), in millimetres, of the lens;c) usable size (d u): dimension(s), in millimetres, of the area that is optically usable.For lenses specified by diameter, the tolerances on size shall be as follows: effective size, d e:d n 1 mm d e d n+ 2 mm usable size,
