SVENSK STANDARD SS- Fastställd 2004-03-12 Utgåva 2 Ögonoptik Råkantade färdiga glasögonglas Del 2: Progressiva glas (ISO 8980-2:2004) Ophthalmic optics Uncut finished spectacle lenses Part 2: Specifications for progressive power lenses (ISO 8980-2:2004) ICS 11.040.70 Språk: engelska Publicerad: april 2004 Copyright SIS. Reproduction in any form without permission is prohibited.
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EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 8980-2 February 2004 ICS 11.040.70 Supersedes EN ISO 8980-2:1997 English version Ophthalmic optics - Uncut finished spectacle lenses - Part 2: Specifications for progressive power lenses (ISO 8980-2:2004) Optique ophtalmique - Verres de lunettes finis non détourés - Partie 2: Spécifications pour les verres progressifs (ISO 8980-2:2004) Augenoptik - Rohkantige fertige Brillengläser - Teil 2: Anforderungen an Gleitsicht-Brillengläser (ISO 8980-2:2004) This European Standard was approved by CEN on 9 January 2004. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard 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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, 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. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. E
Page 2 Provläsningsexemplar / Preview Contents Page Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Classification... 5 5 Requirements... 5 6 Test methods... 8 7 Marking... 9 8 Identification... 10 9 Reference to this part of ISO 8980... 10 Annex A (informative) Material and surface quality... 12 Annex ZA (normative)... 12
Page 3 Foreword This document () has been prepared by Technical Committee 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 the latest by August 2004, and conflicting national standards shall be withdrawn at the latest by August 2004. This document supersedes EN ISO 8980-2:1997. 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, 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 8980-2:2004 has been approved by CEN as without any modifications. NOTE Normative references to International Standards are listed in annex ZA (normative).
Page 4 Provläsningsexemplar / Preview Ophthalmic optics Uncut finished spectacle lenses Part 2: Specifications for progressive power lenses 1 Scope This part of ISO 8980 specifies requirements for the optical and geometrical properties for uncut finished progressive spectacle lenses. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7944, Optics and optical instruments Reference wavelengths ISO 8429, Optics and optical instruments Ophthalmology Graduated dial scale ISO 8598, Optics and optical instruments Focimeters ISO 13666, Ophthalmic optics Spectacle lenses Vocabulary ISO 14889:2003, Ophthalmic optics Spectacle lenses Fundamental requirements for uncut finished lenses 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 13666 as well as the following apply. 3.1 focimeter, focal point on axis FOA focimeter focimeter in which the focal point of the focimeter remains on the axis of the focimeter when the lens under test is measured at a point of the lens where prism is not zero See Figure 1. NOTE Examples of this design include all manual focusing focimeters and some automatic focimeters. 3.2 focimeter, infinite on axis IOA focimeter focimeter in which the collimated beam coincides with the focimeter axis and the focal point of the focimeter goes off the axis of the focimeter when the lens under test is measured at a point of the lens where the prism is not zero
Page 5 See Figure 2. NOTE Some automatic focimeters use this design. Key 1 focimeter's optical axis 2 lens 3 focimeter lens support 4 focal point on the optical axis Figure 1 FOA Focimeter Key 1 focimeter's optical axis 2 lens 3 focimeter lens support 4 infinite on the optical axis Figure 2 IOA Focimeter 4 Classification Finished lenses are classified as follows: a) single-vision finished lenses; b) multifocal finished lenses; c) progressive power finished lenses. 5 Requirements 5.1 General The tolerances shall apply at a temperature of 23 C 5 C.
Page 6 Provläsningsexemplar / Preview 5.2 Optical requirements 5.2.1 General The optical tolerances shall apply at the reference points of the lens at one of the reference wavelengths specified in ISO 7944. The as-worn position can result in the apparent power to the eye being different from that determined as a result of the focimeter measurement. If the manufacturer has applied corrections to compensate for the as-worn position, then the tolerances shall apply to the corrected value and this corrected value shall be stated by the manufacturer on the package or in an accompanying document (see 8.1). The measured addition power is principally influenced by the finished lens form and power. In particular cases, e.g. oblique cylinders or high minus powers, the deviation of the measured addition power of finished progressive lenses can exceed the above mentioned tolerances. The manufacturer shall submit corrected values on request (see 8.1). 5.2.2 Tolerances on the focal power of progressive lenses for the distance portion (back vertex power) 5.2.2.1 Focal power The focal power shall be determined using a focimeter complying with ISO 8598 and using the method described in 6.2 or an equivalent method. NOTE An ISO Technical Report is currently under preparation. This describes those parameters affecting the accuracy and inter- and intra-instruments repeatability of measurement with focimeters, both in general and in relation to off-axis measurements, e.g. the near portion of multifocal and progressive power lenses. 5.2.2.2 Tolerances on the focal power of lenses Spectacle lenses shall comply with the tolerances on the power of each principal meridian, A, and with the tolerances on the cylindrical power, B (see Table 1). Table 1 Tolerances on the focal power of lenses Values in dioptres 1) Power of principal meridian with higher absolute focal power Tolerance on the focal power of each principal meridian, A W 0,00 and u 0,75 Tolerance on the absolute cylindrical power, B 0,75 and u 4,00 4,00 and u 6,00 6,00 W 0,00 and u 6,00 0,12 0,12 0,18 0,18 0,25 6,00 and u 9,00 0,18 0,18 0,18 0,18 0,25 9,00 and u 12,00 0,18 0,18 0,18 0,25 0,25 12,00 and u 20,00 0,25 0,18 0,25 0,25 0,25 20,00 0,37 0,25 0,25 0,37 0,37 1) Dioptres (D) can also be represented by "dpt" or " " and are expressed in reciprocal metres (m 1 ).