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www.ChineseStandard.net Database: 189760 (18 Oct 2025)

JJF 1865-2020 English PDF

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JJF 1865-2020: Calibration Specification for Corneal Topographers
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1865-2020	English	629	Add to Cart	5 days [Need to translate]	Calibration Specification for Corneal Topographers	Valid	JJF 1865-2020

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Basic data

Standard ID	JJF 1865-2020 (JJF1865-2020)
Description (Translated English)	Calibration Specification for Corneal Topographers
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A50
Word Count Estimation	27,292
Date of Issue	2020-09-11
Date of Implementation	2021-03-11
Regulation (derived from)	Announcement No. 40 (2020) of the State Administration for Market Regulation
Issuing agency(ies)	State Administration for Market Regulation

JJF 1865-2020: Calibration Specification for 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.
Calibration Specification for Corneal Topographers National Metrology Technical Specifications of the People's Republic of China Calibration specification for corneal topography 2020-09-11 released 2021-03-11 implementation Issued by the State Administration for Market Regulation Calibration specification for corneal topography Focal point. National Medical Metrology Technical Committee Main drafting unit. China Institute of Metrology Participating in the drafting unit. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences Zhejiang Institute of Metrology This specification entrusts the National Medical Metrology Technical Committee to be responsible for interpretation The main drafters of this specification. Liu Wenli (China Institute of Metrology) Hong Baoyu (Chinese Academy of Metrology) Xue Ruidan (China Institute of Metrology) Participating drafters. Shi Guohua (Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences) Wang Wenxing (Zhejiang Institute of Metrology)

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Terms and measurement units (1) 4 Overview (7) 5 Metering characteristics (8) 5.1 Measuring area (8) 5.2 Standard deviation of measurement of radius of curvature/corneal refractive power (8) 5.3 The axis position indication error of the analog keratometer reading (8) 6 Calibration conditions (8) 6.1 Environmental conditions (8) 6.2 Measurement standards and other equipment (9) 7 Calibration items and calibration methods (9) 7.1 Appearance and functional inspection (9) 7.2 Measuring area (9) 7.3 Standard deviation of measurement of radius of curvature/corneal refractive power (9) 7.4 The axis position indication error of the analog keratometer reading (10) 8 Calibration result expression (11) 9 Recheck interval (11) Appendix A Recommended Format of Original Record of Corneal Topography (12) Appendix B Internal Page (Recommended) Format of Calibration Certificate (15) Appendix C Example of Uncertainty Evaluation of the Calibration Results of Corneal Topography (17)

Introduction

This specification is based on JJF 1001-2011 "General Metrology Terms and Definitions", JJF 1059.2-2012 "Use Monte Compiled by Carlo Method to Evaluate Uncertainty of Measurement, JJF 1071-2010 "Rules for Compiling National Metrology and Calibration Specifications". The formulation of this specification refers to ISO.19980.2012 and ISO /DIS19980.2019 ``Ophthalmic Instruments Corneal Topographic Mapper" and YY0787-2010 "Ophthalmic Instruments Corneal Topographic Mapper". This specification is released for the first time. Calibration specification for corneal topography

1 Scope

This specification applies to the calibration of optical cross-section, Placido ring, and reflective corneal topography. This specification does not apply to the calibration of luminous surface corneal topographs.

2 Reference documents

This specification refers to the following documents. JJG1011-2018 Keratometer JJF 1059.2-2012 Using Monte Carlo Method to Evaluate Measurement Uncertainty ISO 8429 Optics and Optical Instruments Ophthalmology Index Scale ISO 10110-12 Optics and photonics. Drafting preparation of optical components and systems. Part 12.Aspheric surface For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 Terms and units of measurement

3.1 The highest point of the cornea The location on the corneal surface where the average value of the local principal curvature is the largest. 3.2 Corneal meridian The curve cut by the intersection of the corneal surface and the central axis of the corneal topograph. Note. 1 The meridian is characterized by the angle θ, which refers to the angle between the plane that produced it and the horizontal plane (see ISO 8429). 2 For a complete meridian, the range of θ is 0°~180°. 3.2.1 Corneal semi-meridian The part of the meridian extending from the central axis of the corneal topograph to the periphery of the cornea. Note. For the semi-meridian, the range of θ is 0°~360°. 3.3 Corneal eccentricity The eccentricity e of the conic curve that most closely matches the corneal meridian of interest (see 3.9). Note. If there is no specific corneal meridian, the corneal eccentricity is the eccentricity of the flatest corneal meridian (see Table 1). 3.4 Corneal shape factor The magnitude of the asphericity and type (oblong or flat ellipse) of the conic curve that is most consistent with the corneal meridian is represented by E.

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