ANSI-Z80.23-1999.pdf
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1、AMERICAN NATIONAL STANDARDAMERICAN NATIONAL STANDARD OLA ANSI Z80.23-1999 for Ophthalmics Corneal Topography Systems Standard Terminology, Requirements Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not fo
2、r Resale, 05/08/2007 22:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:16:58 MDTNo reproduction
3、 or networking permitted without license from IHS -,-,- ANSI Z80.23-1999 American National Standard for Ophthalmics Corneal Topography Systems Standard Terminology, Requirements Secretariat Optical Laboratories Association Approved October 18, 1999 American National Standards Institute, Inc. Copyrig
4、ht American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Approval of an American National Standard requires revi
5、ew by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected int
6、erests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their exi
7、stence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no ci
8、rcumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the se
9、cretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw
10、this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. American National Standard Published by Optical Laboratories Association P. O. Box 2000 Merrifield, VA 22116-2000 Copyright 2000
11、by Optical Laboratories Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America Developed by The Accredited Committee Z80 for
12、 Ophthalmic Standards - Optical Laboratories Association Z80 Secretariat P. O. Box 2000 Merrifield, VA 22116-2000 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:16:58 MDTNo re
13、production or networking permitted without license from IHS -,-,- i Contents Page Forewordii 1Scope and purpose 1 2Normative references. 1 3Terminology 2 4Requirements. 6 5Test methods and test devices. 6 6Accompanying documents . 10 7Marking. 10 Tables 1Conic section descriptors . 10 2Analysis zone
14、s for accuracy and repeatability testing 10 Figures 1Illustration of axial curvature, Ka, axial radius of curvature, ra, meridional curvature, Km, and meridional radius of curvature, rm 11 2Illustration of the corneal vertex and the apex 11 Annexes ATest surfaces for corneal topographers 12 BStandar
15、dized displays for corneal topographers 16 CCalculation of area weighting values 18 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:16:58 MDTNo reproduction or networking permi
16、tted without license from IHS -,-,- ii Foreword (This foreword is not part of American National Standard Z80.23-1999.) This American National Standard was developed to address the expressed needs of those members of the ophthalmic community who use corneal topography in clinical settings, those who
17、manufacture corneal topographers and those who teach others in the use of the information collected by corneal topographers. In particular there was a need for standardization of the terms and definitions used in the field, for stan- dardization of the methods used for characterizing the performance
18、 of these instru- ments and for standardization of displays of corneal topographical information. The experts who worked together to create this standard felt that at this time there was not sufficient consensus within the ophthalmic community to set performance re- quirements for these instruments
19、beyond those for minimum area measured and measurement sample density. They did feel that the method for testing these instru- ments, to assess their performance and for reporting and results thus obtained, could be standardized and made a part of the requirements of this standard. This standard was
20、 created by a special working group created by the Z80 Subcom- mittee on Ophthalmic Instruments and included experts in the field of corneal topog- raphy from the clinical, manufacturing and academic areas of the ophthalmic community. Suggestions for improvement of this standard will be welcome. The
21、y should be sent to the Optical Laboratories Association, P.O. Box 2000, Merrifield, VA 22116-2000, USA. This standard was processed and approved for submittal to ANSI by the Accredited Standards Committee on Ophthalmics, Z80. Committee approval of this standard does not necessarily imply that all c
22、ommittee members voted for its approval. At the time it approved this standard, the Z80 Committee had the following members: Thomas C. White, M.D., Chairman F. Dow Smith, Ph.D., Vice-Chairman Robert Rosenberg, O.D., Secretary Organization RepresentedName of Representative American Academy of Ophthal
23、mology. Thomas C. White Paul F. Vinger (Alt) Dale Heuer (Alt.) American Academy of Optometry. David M. Loshin American Ceramic Society. Dave Kerko Jackson S. Stroud (Alt.) Herbert Hoover (Alt.) American Optometric Association Donald Pitts Robert Rosenberg (Alt.) William “Joe“ Benjamin (Alt.) Gregory
24、 L. Stephens (Alt.) Jeffrey L. Weaver (Alt.) American Society of Cataract ellipse(01). In order to signify use of an oblate curve of the ellipse, e is sometimes given a negative sign that is not used in computations. Otherwise, use of the prolate curve of the ellipse is assumed. 3.10Elevation: The d
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