BS 3062-1985 Specification for Ophthalmic lens materials.pdf
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1、BRITISH STANDARD CONFIRMED JUNE 1990 BS 3062:1985 Incorporating Amendment No. 1 Specification for Ophthalmic lens materials UDC 617.7-76:681.732.066.03 Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Not for Resale No reproduction or networking pe
2、rmitted without license from IHS - - -BS3062:1985 This British Standard, having been prepared under the directionof the Optical EquipmentStandards Committee,was published underthe authority of the Board ofBSI and comes into effect on 28February 1985 BSI 08-1999 First published April 1959 First revis
3、ion November 1970 Second revision February 1985 The following BSI references relate to the work on this standard: Committee reference OES/3 Draft for comment 84/65629 DC ISBN 0 580 14491 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the
4、Optical Equipment Standards Committee (OES/-) to Technical Committee OES/3 upon which the following bodies were represented: Association of Dispensing Opticians Department of Health and Social Security Federation of Manufacturing Opticians Flat Glass Manufacturers Association Institute of Physics Mi
5、nistry of Defence Amendments issued since publication Amd. No. Date of issue Comments 5467 September 1986 Indicated by a sideline in the margin Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Not for Resale No reproduction or networking permitted
6、without license from IHS - - -BS3062:1985 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Designation 1 3 Category of material 1 4 Refractive index and constringence 1 5 Other properties of ophthalmic materials 1 6 Freedom from visible defects 2 7 Flamma
7、bility 2 8 Information to be provided by the supplier 2 Appendix A Method for determination of refractive index and constringence 3 Appendix B Method for determination of yellowness index and absorptivity of white materials 3 Appendix C Method for determination of luminous transmittance of all ophth
8、almic materials and fatigue of photochromic materials 3 Appendix D Method for determination of solar infra-red transmittance 5 Appendix E Method for determination of internal quality 7 Appendix F Method for assessment of flammability 7 Appendix G Bibliography 7 Figure 1 Spectral transmittance of hea
9、t-absorbing filter 4 Table 1 Refractive property tolerances 1 Table 2 Spectral irradiance E 2for the infra-red spectral range 6 Publications referred to Inside back cover Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Not for Resale No reproducti
10、on or networking permitted without license from IHS - - -BS3062:1985 ii BSI 08-1999 Foreword This revision of this British Standard was prepared under the direction of the Optical Equipment Standards Committee and supersedes the second edition published in1970, which is withdrawn. There are three ma
11、in changes from the previous edition. First, this British Standard takes into account the international proposal to standardize the derivation of constringence. Secondly, the method for conditioning glass specimens before determination of their refractive properties has changed slightly. Thirdly, th
12、e scope has been expanded to cover a greater variety of ophthalmic materials. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself con
13、fer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in
14、 the amendment table on the inside front cover. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Not for Resale No reproduction or networking permitted without license from IHS - - -BS3062:1985 BSI 08-1999 1 1 Scope This British Standard specifies
15、requirements for three categories of white or tinted materials used for the manufacture of ophthalmic spectacle lenses. This standard does not specify requirements for contact lens materials. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Desig
16、nation The material shall be designated according to the following: a) category; b) refractive index and constringence (all materials); c) absorptivity (for white materials) or luminous transmittance (for tinted non-photochromic materials); d) heat-absorbing properties (for tinted materials); e) lum
17、inous transmittance in both the clear and dark states (for photochromic materials). 3 Category of material A material shall be described as being of one of the following three categories. 4 Refractive index and constringence The refractive index and constringence of all materials shall not differ fr
18、om the nominal values declared by the supplier see clause8 a) by more than the appropriate tolerances given inTable 1. The refractive index and constringence shall be determined by the method described inAppendix A using the conditioning method that is appropriate for the material. 5 Other propertie
19、s of ophthalmic materials 5.1 White materials 5.1.1 When white ophthalmic materials are tested by the method described inB.1, B.2 andB.3.1, the yellowness index shall be between0 and1.5. 5.1.2 When white ophthalmic materials are tested by the method described inB.1, B.2 andB.3.2 at wavelengths betwe
20、en500nm and580nm, the average absorptivity shall not be greater than1% per10mm. Table 1 Refractive property tolerances 5.2 Tinted materials When tinted ophthalmic materials are tested by the method described inC.1, C.2.1 andC.3.1, the luminous transmittance shall be within 5% of the value declared b
21、y the supplier see clause8 b)2) for values over40%. For declared values under40%, the luminous transmittance shall be within 2. NOTEFor example, for declared values (X) over40, the luminous transmittance will be within X (X 5/100). For declared values of under40%, the luminous transmittance will be
22、within X 2%. 5.3 Heat-absorbing materials If tinted materials are designated as heat-absorbing see clause8 c), the solar infra-red transmittance of the material, determined by the method described inAppendix D, shall be not greater than the luminous transmittance, when determined by the method descr
23、ibed inC.1, C.2.1 andC.3.1. 5.4 Photochromic materials 5.4.1 When the luminous transmittance of a photochromic material in its clear state is determined by the method described inC.1, C.2 andC.3.2, it shall not differ from the value declared by the supplier see clause8 d)2) by more than5.0% of that
24、value. Category Description 1. Ophthalmic glass Material formed by the fusion of inorganic oxides and of which silica is normally a substantial part. 2. Ophthalmic hard resin Material consisting principally of organic thermosetting plastics. 3. Ophthalmic thermo-plastics Material consisting principa
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