BS EN ISO BRITISH STANDARD 9342-2:2005 Incorporating corrigendum April 2010 Optics and optical instruments Test lenses for calibration of focimeters - Part 2: Test lenses for focimeters used for measuring contact lenses ICS 11.040.70 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BS ENISO 9342-2:2005 National foreword This British Standard is the UK implementation of EN ISO 9342-2:2005.It is identical to ISO 9342-2:2005.Together with BS EN ISO 9342-1, it supersedes BS EN ISO 9342:1998, which is withdrawn. The UK participation in its preparation was entrusted by Technical CommitteeCH/172,Ophthalmicoptics,toSubcommittee CH/172/6, Ophthalmic Instruments. A list of organizations represented on this committee can be obtained on request to its secretary. 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 cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication This British Standard was published under the authority Date of the Standards Policy and Comments Strategy Committee on19January2006 30 April 2010 Supersession details added and committee details corrected. BSI 2010 ISBN 978 0 580 65504 3 EN ISO 9342-2 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHENORM November2005 ICS 11.040.70 Supersedes EN ISO 9342:1998 English Version Optics and optical instruments - Test lenses for calibration of focimeters-Part2:Testlensesforfocimetersusedfor measuring contact lenses (IsO 9342-2:2005) Optique et instruments optiques - Verres étalons pour Optik und optische Instrumente - Prufglaser zur I'etalonnage des frontofocometres - Partie 2: Verres etalons Kalibrierung von Scheitelbrechwert-Messgeraten - Teil 2: pour frontofocometres pour le mesurage des lentilles de Prufglaser fur Scheitelbrechwert-Messgerate fur die Messung von Kontaktlinsen (ISO 9342-2:2005) contact (ISO 9342-2:2005) This European Standard was approved by CEN on 14 November 2005. 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 Central Secretariat orto 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 Central Secretariat 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. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITEEUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005CEN All rights of exploitation in any form and by any means reserved Ref.No.EN ISO 9342-2:2005:E worldwide for CEN national Members. BS EN ISO 9342-2:2005 ENISO 9342-2:2005 (E) Foreword This document (EN ISO9342-2:2005)has been prepared by Technical CommitteeISO/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 May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. ThisdocumentsupersedesENISO9342:1998 the following countries are bound to implement this European Standard: Austria, Belgium Cyprus, Czech Re