1、BRITISH STANDARD BS EN ISO 8429:1997 Implementing Amendment No. 1 to BS 6903:1987, which renumbers the BS as BS EN ISO 8429:1997 not published separately Optics and optical instruments Ophthalmology Graduated dial scale The European Standard EN ISO 8429:1996 has the status of a British Standard ICS
2、11.040.70BS EN ISO8429:1997 This British Standard, having been prepared under the directionof the Health Care Standards Committee, was published under the authorityofthe Board of BSI andcomes intoeffect on 30October1987 BSI 09-1999 The following BSI references relate to the work on this standard: Co
3、mmittee reference HCC/78 Draft for comment 84/65135 DC ISBN 0 580 16211 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Health Care Standards Committee (HCC/-), to Technical Committee CH/78, upon which the following bodies were represe
4、nted: Association of British Dispensing Opticians Association of Contact Lens Manufacturers British College of Ophthalmic Opticians (Optometrists) British Contact Lens Association British Medical Association Consumers Association Department of Health and Social Security Department of Trade and Indus
5、try (National Physical Laboratory) Faculty of Ophthalmologists Federation of Manufacturing Opticians Federation of Ophthalmic and Dispensing Opticians Flat Glass Manufacturers Association Optic (UK) Opticians Prescription Organization Amendments issued since publication Amd. No. Date Comments 9444 J
6、une 1997 Adoption as a European StandardBS EN ISO8429:1997 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO 8429 3 List of references Inside back coverBS EN ISO8429:1997 ii BSI 09-1999 National foreword This British Standard was pre
7、pared by Technical Committee CH/78 (formerly HCC/78). It is the English language version ofENISO8429:1996 Optics and optical instruments Ophthalmology Graduated dial scale, published by the European Committee for Standardization (CEN). It is identical with ISO8429:1986, published by the Internationa
8、l Organization for Standardization (ISO). It has been assumed in the drafting of this British Standard that the execution of its provision is entrusted to appropriately qualified and experienced people. At the time of publication of this standard, other British Standards that related to opthalmic su
9、bjects include the following. BS 2738, Specification for tolerances on optical properties of mounted spectacle lenses. BS 3062, Specification for ophthalmic lens materials. BS 3162, Specification for ophthalmic trial case lenses. BS 3172, Specification for screw threads for spectacle frames. BS 3199
10、, Method for measurement of spectacles including a glossary of terms. BS 3521, Glossary of terms relating to ophthalmic lenses and spectacle frames. BS 3668, Specification for red and green filters used in ophthalmic dichromatic and dissociation tests. BS 4274, Specification for test charts for dete
11、rmining distance visual acuity. BS 6625, Specification for spectacle frames. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with thos
12、e used in British Standards; attention is drawn especially to the following. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. A British Standard does not purport to include all the necessary provisions of a contract. Users of
13、British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 4, an inside
14、 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 the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8429 June 1996 ICS 11.040.70 English version Op
15、tics and optical instruments Ophthalmology Graduated dial scale (ISO 8429:1986) Optique et instruments doptique Ophtalmologie Echelle gradue (ISO8429:1986) Optik und optische Instrumente Ophthalmologie Gradbogenschema (ISO8429:1986) This European Standard was approved by CEN on 1996-06-01. CEN membe
16、rs 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 applicatio
17、n to the Central Secretariat 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 Central Secretariat has the sa
18、me status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardizat
19、ion Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN memebers Ref. No. EN ISO 8429:1996EN ISO8429:1996 BSI 09-1999 2 Foreword The text of the International Standard from ISO/TC172, Optics and optical
20、 instruments, of the International Organization for Standardization (ISO) has been taken over as a European Standard by the Technical Committee CEN/TC170, Ophthalmic optics, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by pu
21、blication of an identical text or by endorsement, at the latest by December1996, and conflicting national standards shall be withdrawn at the latest by December1996. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
22、this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope and field of application 3 2 Description of the system 3 3 Exam
23、ple 3 Figure 3EN ISO8429:1996 BSI 09-1999 3 1 Scope and field of application This International Standard gives specifications for the angular coordinate system to be used in the design of scales, reticles or other display means incorporated in instruments for determining optical data on human eyes o
24、r corrective lenses for human eyes. 2 Description of the system The coordinate system, specified in this International Standard and sometimes called the TABO system, describes a) the angular orientation of the cylinder axis, when used to describe the refractive error of the eye or the refractive eff
25、ect of a contact or spectacle lens; b) the angular orientation of the prism base, when used to describe the prismatic effect of a contact or spectacle lens in polar coordinates; c) the angular orientation of the principal curvature meridians, when used to describe the curvature of a surface such as
26、the cornea or a lens. The coordinate system is the same whether it refers to the right eye or to the left eye. When used, the coordinate system is described as it appears to a person viewing the eyes and the spectacle lenses correctly placed in front of the eyes from outside. The zero axis of the co
27、ordinate system is horizontal and, in the case where the numbering is from0 to360 , it is the righthand portion of the horizontal axis. The angular value increases in the counter-clockwise direction with90 corresponding to the vertical axis. When used to define cylinder axis or orientation of princi
28、pal curvature meridians, the angular value shall be expressed as a number between0 and180 . When used to define prism base orientation, the angular value shall be expressed as a number between0 and360 , marked by the point where the base of the prism touches the TABO circle. 3 Example An example of
29、a scale designed using the coordinate system, as described inclause2, is shown in the Figure. Although it is shown with a specific angular scale design, this is by no means meant to imply that other designs cannot be used and still be considered as within the scope and intent of this International S
30、tandard. Figure 4 blankBS EN ISO8429:1997 BSI 09-1999 List of references See national foreword.BSEN ISO 8429:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standa
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