Standard
Track updates
AS ISO 9342.1:2017
[Current]Optics and optical instruments — Test lenses for calibration of focimeters, Part 1: Test lenses for focimeters used for measuring spectacle lenses
Adopts ISO 9342 1:2005 which specifies requirements for test lenses for the calibration of focimeters that are used for the measurement of spectacle form lenses.
Published: 21/09/2017
Pages: 8
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 test lenses
4.1 General
4.2 Spherical test lenses
4.3 Prismatic test lenses
4.4 Cylindrical test lenses
5 Tolerances
5.1 Tolerances for spherical test lenses
5.2 Tolerances for prismatic test lenses
5.3 Tolerances for cylindrical test lenses
Annex A
A.1 General
A.2 Selection of glass
A.3 Calculation of nominal back surface radius of curvature
A.4 Selection of the closest standard radius
A.5 Calculation of lens thickness and selection of front surface radius
A.6 Determination of lens back surface power and error tolerance
A.7 Example of a calculation for expected error
Cited references in this standard
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