BS EN ISO 9342-1:2023 – TC
$186.33
Tracked Changes. Optics and optical instruments. Test lenses for calibration of focimeters – Reference lenses for focimeters used for measuring spectacle lenses
| Published By | Publication Date | Number of Pages |
| BSI | 2023 | 62 |
This document 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. It also gives a method for the determination of the back vertex power of the reference lenses. NOTE It is accepted that other reference lenses can also be used with powers within the given range, manufactured to the same standard of accuracy and form, but different back vertex powers. However, only lenses with integer nominal powers, as described in 4.1, can be used for the calibration of digitally-rounding focimeters.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 38 | undefined |
| 40 | European foreword Endorsement notice |
| 42 | Foreword |
| 43 | 1 Scope 2 Normative references 3 Terms and definitions |
| 45 | 4 Design requirements and recommendations for reference lenses 4.1 General 4.2 Spherical reference lenses 4.2.1 Standard spherical reference lenses |
| 46 | 4.2.2 Low power spherical reference lenses (optional) |
| 47 | 4.3 Prismatic reference lenses 4.4 Cylindrical reference lens |
| 48 | 4.5 Spherocylindrical-power reference lens |
| 49 | 4.6 Reference filter 4.7 Darker reference filters (optional) |
| 51 | Annex A (informative) Design of spherical reference lenses |
| 56 | Annex B (informative) Design and/or validation of prismatic reference lenses |
| 59 | Annex C (informative) Verification of the cylindrical reference lens |
| 61 | Bibliography |
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