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JJG 579-2025 English PDF

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JJG 579-2025: Trial Case Lenses
Status: Valid

JJG 579: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 579-2025English439 Add to Cart 4 days [Need to translate] Trial Case Lenses Valid JJG 579-2025
JJG 579-2010English509 Add to Cart 4 days [Need to translate] Verification regulation of trial case lenses Valid JJG 579-2010
JJG 579-1998English359 Add to Cart 3 days [Need to translate] Verification Regulation of Trial Case Lenses Obsolete JJG 579-1998
JJG 579-1988EnglishRFQ ASK 3 days [Need to translate] (Chinese Industry Standard) Obsolete JJG 579-1988

Basic data

Standard ID JJG 579-2025 (JJG579-2025)
Description (Translated English) Trial Case Lenses
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 21,284
Date of Issue 2025-02-08
Date of Implementation 2025-08-08
Issuing agency(ies) State Administration for Market Regulation

JJG 579-2025: Trial Case Lenses

---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.
National Metrology Verification Regulations of the People's Republic of China Verification procedures for trial lens boxes Released on 2025-02-08 2025-08-08 Implementation The State Administration for Market Regulation issued Verification procedures for trial lens boxes JJF579-2025 Replaces JJG 579-2010 Responsible unit. National Medical Metrology Technical Committee Main drafting unit. China National Institute of Metrology Participating in the drafting. Hangzhou Quality and Technical Supervision Inspection Institute Lianyungang Tiannuo Optical Instrument Co., Ltd. This regulation is entrusted to the National Medical Metrology Technical Committee for interpretation The main drafters of this regulation are. Yang Lei (China Institute of Metrology) Liu Wenli (China National Institute of Metrology) Participating drafters. Shao Lei (Hangzhou Quality and Technical Supervision Inspection Institute) Qin Liangping (Lianyungang Tiannuo Optical Instrument Co., Ltd.)

Table of contents

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 4 Overview(3) 4.1 Classification (3) 4.2 Application (3) 4.3 Reference wavelength (3) 5 Metrological performance requirements (3) 5.1 Vertex power indication error (3) 5.2 Optical center displacement error (4) 5.3 Axis indication error of cylindrical trial lenses (4) 5.4 Baseline indication error of prismatic trial lenses (5) 6 General technical requirements(5) 6.1 Wrong film (5) 6.2 Basic Configuration(5) 6.3 Appearance(6) 6.4 Trial lens markings (6) 7 Measuring instrument control (7) 7.1 Calibration equipment (7) 7.2 Verification conditions (7) 7.3 Verification Items (7) 7.4 Verification methods (8) 7.5 Processing of test results (9) 7.6 Verification cycle (9) Appendix A Auxiliary trial lenses (10) Appendix B Original Record Format of Trial Lens Boxes (12) Appendix C Recommended format of the calibration certificate/calibration result notice (inside page) for trial lens boxes (14)

Introduction

JJF1002 "Rules for the Preparation of National Metrology Verification Procedures", JJF1001 "General Metrology Terms and Definitions" and JJF1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series supporting the formulation and revision of this regulation. specification. 2010 The verification regulations for trial lens boxes were revised. Compared with JJG 579-2010, in addition to the editorial revisions, the main The main technical changes are as follows. --- Added the introduction; ---Adjusted the order of referenced documents and updated the year of referenced documents; --- Added English equivalents and term sources to terms and units of measurement; --- All "tolerances" in the measurement performance have been changed to "indication errors", and the table of maximum allowable errors has been modified. Description method; --- Modified the expression of the value range of various types of trial lenses in the basic configuration requirements and the applicability of the basic configuration requirements Use range; --- Modified the indication of identification mark of trial lenses; --- Modified the name of the verification item to keep it consistent with the corresponding metrological performance requirements; --- In the verification method, change "identification" to "nominal value". In the metrological performance requirements of the verification method, Change all "the side of the lens to be tested with lettering facing upward" to "the side of the lens to be tested with nominal value engraved facing upward"; --- In the processing of verification results, data processing content has been added; ---Optimized the original recording format of the trial lens box. The previous versions of this regulation are as follows. ---JJG 579-1998 Optometry lens box; ---JJG 579-2010 Trial lens box. Verification procedures for trial lens boxes

1 Scope

This procedure applies to the initial verification, subsequent verification and in-use verification of various full-aperture and reduced-aperture trial lens boxes. examine.

2 References

This specification refers to the following documents. JJG 580-2005 Focimeter GB 17342-2009 Ophthalmic instrument trial lenses ses) For any referenced document with a date, only the version with the date is applicable to this Regulation; for any referenced document without a date, The latest version (including all amendments) shall apply to this regulation.

3 Terminology and units of measurement

The terms and definitions defined in GB 17342-2009 and ISO 9801.2009 and the following terms and definitions apply to this specification. 3.1 Vertex power The reciprocal of the paraxial vertex focal length of a lens measured in meters. A lens has two vertex powers. [Source. GB 17342-2019, 3.1] 3.2 Back-vertex power The reciprocal of the lens's paraxial back focal length measured in meters. As shown in Figure 1, the distance from the lens' back vertex to the paraxial back focal length is The distance from the point is called the paraxial back vertex focal length, represented by the symbol l'f, and its reciprocal is called the back vertex focal length, which is 1/l'f. The unit of focal power is minus one meter (m-1), and the unit name is diopter. Note. A lens has two vertex powers, front and back. Unless otherwise specified, the vertex power of a lens refers to its back vertex power. [Source. GB 17342-2019, 3.2] 3.3 Prismatic power The measure of the deviation of light after passing through a specified point on the lens (usually the center of the lens), see Figure 2. The unit of degree is centimeter per meter (cm/m), and the unit name is prism diopter. [Source. GB 17342-2019, 3.3]

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