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AS/NZS ISO 9342.1:2024
[Current]Optics and optical instruments - Test lenses for calibration of focimeters, Part 1: Reference lenses for focimeters used for measuring spectacle lenses
AS NZS ISO 9342.1:2024 identically adopts ISO 9342-1:2023, which specifies requirements for reference lenses for the calibration and verification of focimeters that are used for the measurement of spectacle form lenses, e.g. those complying with ISO 8598-1
Published: 20/12/2024
Pages: 19
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Design requirements and recommendations for reference lenses
4.1 General
4.2 Spherical reference lenses
4.2.1 Standard spherical reference lenses
4.2.2 Low power spherical reference lenses (optional)
4.3 Prismatic reference lenses
4.4 Cylindrical reference lens
4.5 Spherocylindrical-power reference lens
4.6 Reference filter
4.7 Darker reference filters (optional)
Annex A
A.1 General
A.2 Selection of glass
A.3 Design and selection of parameters
A.4 Determination of lens back vertex power and uncertainty
A.5 Example of a calculation for uncertainty
Annex B
B.1 Using the apical angle
B.1.1 General
B.1.2 Selection of glass
B.1.3 Steps in the design
B.2 Direct measurement of deviation
B.2.1 General
B.2.2 Method
Annex C
C.1 Axis alignment with the edge of the lens
C.1.1 Principle
C.1.2 Measurement
C.1.3 Uncertainty of measurement
C.2 Displacement of the centre line
Bibliography
Cited references in this standard
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