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YY/T 0787-2024: Ophthalmic instruments - Corneal topographers
Status: Valid YY/T 0787: Evolution and historical versions
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Ophthalmic instruments - Corneal topographers
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YY/T 0787-2024
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| YY 0787-2010 | English | 839 |
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Opthalmic instruments. Corneal topographers
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PDF similar to YY/T 0787-2024
Basic data | Standard ID | YY/T 0787-2024 (YY/T0787-2024) | | Description (Translated English) | Ophthalmic instruments - Corneal topographers | | Sector / Industry | Medical Device & Pharmaceutical Industry Standard (Recommended) | | Classification of Chinese Standard | C40 | | Classification of International Standard | 11.040.70 | | Word Count Estimation | 26,264 | | Date of Issue | 2024-09-29 | | Date of Implementation | 2025-10-15 | | Older Standard (superseded by this standard) | YY/T 0787-2010 | | Issuing agency(ies) | State Drug Administration | | Summary | This standard specifies the minimum requirements, accompanying documents and markings for corneal topograph instruments and systems, and specifies the corresponding test methods. This standard applies to instruments or systems for measuring the surface shape of the human cornea. This standard does not apply to keratometers in ophthalmic instruments. | YY/T 0787-2024: Ophthalmic instruments - Corneal topographers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 11.040.70
CCSC40
Pharmaceutical Industry Standards of the People's Republic of China
Replaces YY/T 0787-2010
Ophthalmic instruments Corneal topograph
(ISO.19980.2021,MOD)
Released on 2024-09-29
Implementation on October 15, 2025
The State Drug Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Requirements 7
5 Test methods 8
6 Attached Documents 12
7 Mark 12
Appendix A (Informative) Test surface of corneal topograph 13
Appendix B (Normative) Standard display of corneal topograph 14
Appendix C (Normative) Repeatability Test Method 17
Appendix D (Normative) Calculation of Area Weight Value 18
References 20
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces YY/T 0787-2010 "Ophthalmic Instruments Corneal Topography", and compared with YY/T 0787-2010, except for the structural adjustment
In addition to the integration and editorial changes, the main technical changes are as follows.
--- Deleted the term and definition of "corneal semi-meridian" (see 3.3.1 of the.2010 edition);
--- Deleted the term and definition of "corneal curvature constant" (see 3.11 of the.2010 edition);
--- Deleted the term and definition of "meridian plane" (see 3.13 of the.2010 edition);
--- Deleted the term and definition of "p value" (see 3.15 of the.2010 edition);
--- Deleted the terms and definitions of "Placido ring mark" (see 3.16 of the.2010 edition);
--- Deleted the term and definition of "aspherical surface" (see 3.18.1 of the.2010 edition);
--- Deleted the term and definition of "non-annular surface" (see 3.18.2 of the.2010 edition);
--- Deleted the term and definition of "oblate noodles" (see 3.18.3 of the.2010 edition);
--- Deleted the term and definition of "long oval surface" (see 3.18.4 of the.2010 edition);
--- Deleted the term and definition of "cross section" (see 3.20 of the.2010 edition);
--- Added the term and definition of "corneal refractive power" (see 3.11);
--- Deleted the "material" requirements (see 4.5 of the.2010 edition);
--- Deleted the “cleaning, disinfection or sterilization measures” requirement (see 4.6 of the.2010 edition);
--- Deleted the "environmental conditions" requirement (see 4.7 of the.2010 edition);
--- Changed the "Electrical safety" requirements (see 4.5, 4.8 of the.2010 edition);
--- Added "electromagnetic compatibility" requirements (see 4.6);
--- Deleted the "Material Test" test method (see 5.5 of the.2010 edition);
--- Deleted the test method of “Cleaning, disinfection or sterilization measures inspection” (see 5.6 of the.2010 edition);
--- Deleted the "Environmental test" test method (see 5.7 of the.2010 edition);
--- Added the "measurement area" test method (see 5.1.1);
--- Added the "Measurement of sample density" test method (see 5.1.2);
--- Added the "repeatability test" test method (see 5.1.4, Appendix C);
--- Changed "Type test of test surface" (see 5.2.6, 5.2.6 of the.2010 edition);
--- Changed "Data Collection---Test Surface" (see 5.3, 5.3 of the.2010 edition);
--- Changed "Data Analysis" (see 5.4, 5.4 of the.2010 edition);
--- Added the "color representation of results" test method (see 5.5);
--- Added the "electromagnetic compatibility" test method (see 5.7);
--- Changed "Appendix B (Normative) Standard Display of Corneal Topographer" (see Appendix B, Appendix B of the.2010 edition).
This document is modified to adopt ISO.19980.2021 "Ophthalmic instruments - Corneal topographers".
This document has the following structural adjustments compared to ISO.19980.2021.
--- According to the order of the appendices referenced in this document, Appendix D of this document corresponds to Appendix C of ISO.19980.2021.
The technical differences between this document and ISO.19980.2021 and their reasons are as follows.
---Replaced IEC 60601-1.2005 A1.2012 A2.2020 with the normative reference GB 9706.1 to adapt to my country's technical
Technical conditions;
--- Added normative reference document YY 9706.102 (see Chapter 2, 4.6, 5.7) to adapt to my country's technical conditions;
--- Added normative reference document JJF1059.1-2012 (see Chapter 2, Appendix C) to adapt to my country's technical conditions;
--- The terms and definitions of “ellipsoidal surface”, “aspherical surface”, “non-toric surface”, “oblate surface” and “long oval surface” have been deleted (see ISO.19980.2021
3.14, 3.16.1, 3.16.2, 3.16.3, 3.16.4) to adapt to my country's technical conditions;
--- The requirements for the ellipsoidal test surface (see 5.2.6 of ISO.19980.2021) have been deleted to adapt to my country's technical conditions;
--- Deleted the high-order polynomial rotation surface (see A.3 of ISO.19980.2021) to adapt to my country's technical conditions;
--- Added "electrical safety" requirements (see 4.5) to adapt to my country's technical conditions;
--- Added "electromagnetic compatibility" requirements (see 4.6) to adapt to my country's technical conditions;
--- Added the "measurement area" test method (see 5.1.1) to increase operability and facilitate the implementation of the standard;
--- Added the "measurement of sample density" test method (see 5.1.2) to increase operability and facilitate the implementation of the standard;
--- Changed the repeatability test method (see 5.1.4, Appendix C, 5.1.2, Appendix D of ISO.19980.2021), added operable
To facilitate the implementation of standards;
--- Changed the test surface verification accuracy requirements (see 5.2.5, 5.2.5 of ISO.19980.2021) to adapt to my country's technical conditions
parts, increase operability and facilitate the implementation of standards;
--- Added the location of the measurement point (see 5.2.6) to increase operability and facilitate the implementation of the standard;
--- Changed formula (11) to formula (13) [see 5.4.3, formula (11) to formula (13) of ISO.19980.2021] to facilitate standardization.
implement;
--- Added the "color representation of results" test method (see 5.5) to increase operability and facilitate the implementation of the standard;
--- Added the "electrical safety" test method (see 5.6) to increase operability and facilitate the implementation of the standard;
--- Added the "electromagnetic compatibility" test method (see 5.7) to increase operability and facilitate the implementation of the standard;
--- Deleted the requirements in 6 d) of the attached document [see 6 d) of ISO.19980.2021] to adapt to my country's national conditions;
--- Changed the title of Appendix B, changing "Appendix B (Informative Appendix) Standard Display of Corneal Topography" to "Appendix B (Specification)
(see Annex B of ISO.19980.2021) for standard display of corneal topographs
implement.
The following editorial changes were made to this document.
--- Changed the tolerance method of the radius of curvature of the spherical test surface in 5.2.6 (see 5.2.6, 5.2.6 of ISO.19980.2021) to adapt
The national conditions of our country;
--- Changed Table B.2 in Appendix B, swapped "B" and "S" in the header of Table B.2 and corrected some values, and changed "hue, brightness"
Hue, saturation (HBS)” is changed to “hue, saturation, brightness (HSB)” (see Annex B, Annex to ISO.19980.2021
B) to facilitate the implementation of standards.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed by the State Food and Drug Administration.
This document was prepared by the National Technical Committee for Optics and Photonics Standardization, Medical Optics and Instruments Subcommittee (SAC/TC103/
SC1) is responsible for the following.
This document was drafted by. Zhejiang Medical Device Inspection Institute, Shanghai Mevo Precision Instrument Co., Ltd.
The main drafters of this document are Peng Jianhua, Wang Jingtao, Hu Yiping, Huang Tao, Zhan Weida and Chen Peng.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2010 as YY 0787-2010;
---This is the first revision.
Ophthalmic instruments Corneal topograph
1 Scope
This document specifies the minimum requirements, accompanying documentation and marking for corneal topograph instruments and systems and describes the corresponding test methods.
This document applies to instruments or systems for measuring the shape of the human corneal surface.
NOTE The measurement result can be the surface curvature of a local area, the three-dimensional topographical dimensions of the surface, or other more comprehensive parameters used to characterize the surface characteristics.
This document does not apply to keratometers used in ophthalmic instruments.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB 9706.1 Medical electrical equipment Part 1.General requirements for basic safety and essential performance (GB 9706.1-2020,
IEC 60601-1.2012, MOD)
YY 9706.102 Medical electrical equipment Part 1-2.General requirements for basic safety and essential performance Collateral standard. Electromagnetic compatibility
Capacity requirements and tests (YY 9706.102-2021, IEC 60601-1-2.2007, MOD)
JJF1059.1-2012 Evaluation and Expression of Measurement Uncertainty
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
corneal ridge cornealapex
The location on the corneal surface where the local curvature is greatest.
Note. See Figure 1.
3.2
Corneal eccentricity
ec
The eccentricity e of the conic curve that best fits the specified corneal meridian (3.3).
NOTE. If no meridian is specified, the corneal eccentricity is the eccentricity of the flattest corneal meridian (see Table 1).
3.3
Corneal meridian
The intersection of the corneal surface and the plane passing through the axis of the corneal topograph (3.6).
Note 1 to entry. A meridian is characterised by θ, which is the angle between the plane producing the meridian and the horizontal plane (see ISO 8429).
Note 2.The θ value range of a complete meridian is 0°~180°.
3.4
Corneal shape factor cornealsharpfactor
The value defining the type of conic curve that best fits the corneal meridian (3.3) is given by formula (1).
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