JJF 1772-2019 English PDF

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JJF 1772-2019: Program of Pattern Evaluation of Trial Case Lenses
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Basic data

Standard ID: JJF 1772-2019 (JJF1772-2019)
Description (Translated English): Program of Pattern Evaluation of Trial Case Lenses
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A60
Classification of International Standard: 17.180
Word Count Estimation: 27,260
Date of Issue: 2019
Date of Implementation: 2020-03-31
Issuing agency(ies): State Administration for Market Regulation

JJF 1772-2019: Program of Pattern Evaluation of 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.
Program of Pattern Evaluation of Trial Case Lenses National Measurement Technical Specification of the People's Republic of China Outline of evaluation of type of optometry lens box Published on December 31,.2019 2020-03-31 Implementation Issued by the State Administration of Market Supervision and Administration Outline of evaluation of type of optometry lens box TrailCaseLenses Centralized unit. National Medical Metrology Technical Committee Main drafting unit. China Academy of Metrology Participated in the drafting unit. Zhejiang Institute of Metrology This specification entrusts the National Medical Metrology Technical Committee to interpret The main drafters of this specification. Yang Lei (Chinese Academy of Metrology) Liu Wenli (Chinese Academy of Metrology) Chen Yan (Chinese Academy of Metrology) Participating drafters. Ma Yao (Zhejiang Institute of Metrology)

table of Contents

Introduction (Ⅲ) 1 Scope (1) 2 References (1) 3 Terms and definitions (1) 3.1 Top power (1) 3.2 Back top power (1) 3.3 Prism degree (1) 3.4 Full aperture refraction lenses (2) 3.5 Reducing aperture refraction lenses (2) 3.6 Superimposed lens chain (2) 3.7 Spherical lenses (2) 3.8 Cylindrical Optometry Lenses (2) 4 Overview (2) 4.1 Classification (2) 4.2 Uses (2) 5 Legal management requirements (2) 5.1 Unit of measurement (2) 5.2 Logo (2) 6 Measurement requirements (3) 6.1 Wrong film (3) 6.2 Indication error of top power (3) 6.3 Indication error of optical center displacement (4) 6.4 Cylindrical optometry lens axis position indication error (4) 6.5 Baseline indication error of prismatic optometry lenses (4) 7 General technical requirements (5) 7.1 Appearance (5) 7.2 Basic configuration (5) 7.3 Optometry lens logo (6) 7.4 Climate environment adaptability (7) 8 Type evaluation items (7) 9 Provide technical data and test prototype for review (7) 9.1 Technical data (7) 9.2 Number of prototypes provided (7) 9.3 How to use the prototype (8) 10 Test methods and conditions for type evaluation items (8) 10.1 Preparation before the test (8) 10.2 Appearance (8) 10.3 Wrong film (8) 10.4 Indication error of top power (8) 10.5 Indication error of optical center displacement (9) 10.6 Cylindrical axis position indication error (10) 10.7 Indication error of prism baseline (10) 10.8 Basic configuration (11) 10.9 Optometry lens logo (11) 10.10 Climate and environmental adaptability (11) 10.11 Judgment of type evaluation results (12) 11 Table of measuring instruments and equipment used in the test project Appendix A. The original record format of type evaluation of optometry lenses (14) Appendix B. Judgment of the evaluation results of the type of optometry lenses

Introduction

This type evaluation outline is based on JJF 1015-2014 "General Specification for Type Evaluation of Measuring Instruments", JJF 1016- 2014 "Guidelines for the Compilation of Outlines for Measuring Apparatus Type Evaluation" and JJF 1051-2014 "Code for Nomenclature and Classification of Measuring Apparatus" Code "preparation. The technical indicators of this type evaluation outline refer to JJG579-2010 "Refractive Lens Box", GB 17342- 2009 "Ophthalmic Instruments Optometry Lens", ISO 9801..2009 "Ophthalmic Instruments Optometry Lens Box" (Ophthalmic instruments-Trailcaselenses) and other technical documents, of which JJG579-2010 is the primary reference standard. This type evaluation outline is released for the first time. Outline of evaluation of type of optometry lens box

1 Scope

This type evaluation program is applicable to the type evaluation of the refraction lens box with the classification code of 33720000.

2 Reference documents

The following documents are cited in this type evaluation outline. JJG579 Optometry Lens Case GB 17342 Ophthalmic Instruments Optometry Lenses ISO 9801 Ophthalmic Instruments Optometry Lens Box (Ophthalmicinstruments-Trailcaselenses) For dated reference documents, only the dated version is applicable to this type of evaluation outline; those that are not dated The latest version (including all amendments) of the cited documents is applicable to this type evaluation outline.

3 Terms and definitions

3.1 Top power vertexpower The reciprocal of the paraxial focal length of the lens in meters. Note. A lens contains two top and bottom power. 3.2 Back-vertexpower The reciprocal of the focal length of the lens's paraxial back vertex in meters. As shown in Figure 1, the distance from the back vertex of the lens to the focal point of the image side The distance is called the back top focal length, which is represented by the symbol lf '. Its reciprocal is called the back vertex power, or 1/lf '. Unit of back vertex power It is the reciprocal of the meter (m-1), and the unit name is diopter. Note. Unless otherwise specified, the top power of the lens refers to the back top power. 3.3 Prism power A measure of the deviation of light after passing a specified point on the lens (usually the center of the lens), a unit of prism It is centimeters per meter (cm/m), and the unit name is prism diopter. F-object focus; F'-image focus; H-object principal point; H'-image principal point; f-object square focal length; f'-image square focal length; lf-front top focal length; lf'-back top focal length Figure 1 Schematic diagram of the top focal length of the lens ......

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