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JJG 1088-2019

Chinese Standard: 'JJG 1088-2019'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
JJG 1088-2019English319 Add to Cart Days<=4 Standard Devices for Calibration of Ophthalmometers Valid JJG 1088-2019
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BASIC DATA
Standard ID JJG1088-2019 (JJG1088-2019)
Description (Translated English) (Verification Regulation of Measuring Standard Apparatus for Keratometer)
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 16,129
Date of Issue 2019-09-27
Date of Implementation 2020-03-27
Older Standard (superseded by this standard) JJG 1088-2013
Drafting Organization Chinese Academy of Metrology
Administrative Organization National Medical Metrology Technical Committee
Regulation (derived from) Announcement No. 40, 2019 of the State Administration of Market Supervision and Administration
Issuing agency(ies) State Administration of Market Supervision and Administration

JJG 1088-2019
(Verification Regulation of Measuring Standard Apparatus for Keratometer)
National Measurement Verification Regulations of the People's Republic of China
Measuring standard for keratometer
2019-09-27 release
2020-03-27 Implementation
Issued by the State Administration of Market Supervision and Administration
Measuring standard for keratometer
Verification regulations
Replace JJG 1088-2013
Centralized unit. National Medical Metrology Technical Committee
Main drafting unit. China Academy of Metrology
Participated in the drafting unit. Jiangsu Institute of Metrology
The National Medical Metrology Technical Commission is responsible for the interpretation of this regulation
The main drafters of this regulation.
Zhang Jiyan (Chinese Academy of Metrology)
Hong Baoyu (Chinese Academy of Metrology)
Participating drafters.
Chen Yan (Chinese Academy of Metrology)
Yao Shaowei (Jiangsu Institute of Metrology)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 References (1)
3 Terms and definitions (1)
3.1 Keratometer (1)
3.2 Measuring standard for keratometer (1)
3.3 Corneal diopter (1)
3.4 Face shape deviation (1)
4 Overview (1)
5 Measurement performance requirements (2)
5.1 Standard for curvature radius (2)
5.2 Axial standard (2)
6 General technical requirements (3)
6.1 Appearance (3)
6.2 Logo (3)
7 Control of measuring instruments (3)
7.1 Verification conditions (3)
7.2 Verification items (3)
7.3 Verification method (3)
7.4 Processing of verification results (6)
7.5 Verification period (6)
Appendix A Recommended Format of Original Records for Measuring Standards for Keratometry (7)
Appendix B. Recommendations for the Certificate of Verification of the Measuring Standard for Corneal Curvometer/Notification of Verification Results (Inner Page)
Format (9)
introduction
JJF1002 "Rules for Compiling National Measurement Verification Regulations", JJF1001 "General Measurement Terms and Definitions"
JJF1059.1 "Measurement Uncertainty Evaluation and Representation" together constitute the basic series supporting the preparation and revision of this code
specification.
This procedure is based on the international standard ISO 10343..2014 "Ophthalmic Instrument Keratometer" (Ophthalmicin-
struments Ophthalmometers), based on JJG 1088-2013
Device "was revised. Compared with JJG 1088-2013, in addition to editorial changes, the main technical changes are as follows.
--- The introduction has been modified to add a description of the main technical changes;
--- Modified the reference file;
--- In terms and measurement units, the terms such as corneal curvature meter and corneal curvature meter standard are improved;
--- In the overview, the description of the axis standard and measuring bracket has been added;
--- In the measurement performance requirements, the measurement performance requirements of the shaft position standard are added;
--- In the general technical requirements, amended the relevant requirements for the marking of the corneal curvature meter with a measuring standard;
--- In the verification items controlled by measuring instruments, the radius of curvature of the torus surface of the axial position standard and the axial position are added
Verification items;
--- In the verification method of measuring instrument control, the curvature radius and axial position
Description of verification method;
--- Recommended format for the original record of the corneal keratometer and the recommended format on the inner page of the test certificate/test result notice
Modifications have been made to increase the content of the curvature radius of the surface of the axis standard and the axis position.
The release of previous versions of this regulation.
--- JJG 1088-2013.
Verification Regulation of Measuring Standard Apparatus for Keratometer
1 Scope
This regulation is applicable to the first verification, subsequent verification and in-use inspection of the measuring standard for corneal curvature meter.
2 Reference documents
This regulation refers to the following documents.
GB/T 2831-2009 Surface deviation of optical parts
ISO 10343-2014 Ophthalmic Instruments Keratometer (OphthalmicinstrumentsOphthal-
mometers)
For dated references, only the dated versions are applicable to this Regulation; for those without dates
The latest version (including all amendments) is applicable to this regulation.
3 Terms and definitions
3.1 Keratometer ophthalmometer; keratometer
An instrument for measuring the radius of curvature of the human cornea, corneal power and axial position. Usually, it refers to measuring the center of the cornea
region.
Note. Some keratometers can also measure the peripheral area of the cornea and the base arc of the contact lens (the curvature of the optical center of the lens is half
path).
3.2 Standard devices for calibration of ophthalmometers
A measuring standard used to verify or calibrate the curvature radius, corneal diopter and axial position of a keratometer.
3.3 Keratometric dioptre; cornealrefractivepower
The definition of corneal power is shown in formula (1).
F =
337.5
(1)
In the formula.
F --- Cornea diopter, m-1;
r --- The radius of curvature of the anterior corneal surface, mm.
3.4 Surface form deviation
The deviation of the measured optical surface relative to the reference optical surface.
Note.
1 Within the circular inspection range detected by the model, the surface shape deviation is the interference fringe observed through the vertical position (commonly known as light
Circle) to determine the number, shape, variation and color;
2 When the measured optical surface is in contact with the reference optical surface, it is defined as positive (high aperture, also known as convex aperture); when the
When the measuring optical surface is in contact with the edge of the reference optical surface, it is specified as negative (low aperture, also known as concave aperture).
4 Overview
The measuring standard for keratometer consists of 3 parts for radius of curvature standard, axial position standard and measuring bracket
Related standard: JJF 1088-2015    JJF 1248-2020