AS/NZS 21987:2019

AS/NZS 21987:2019 Ophthalmic optics - Mounted spectacle lenses (ISO 21987:2017, MOD)

Preface

Foreword

1 Scope

2 Normative references

3 Terms and definitions

4 Classification

5 Requirements

5.1 Reference temperature

5.2 Lenses used in manufacturing complete spectacles

5.3 Optical requirements

5.3.1 General

5.3.2 Back vertex power

5.3.3 Direction of the cylinder axis

5.3.4 Addition power or variation power

5.3.5 Prism imbalance (relative prism error) for mounted single-vision lenses (excluding position-specific single-vision lenses) and multifocal lenses

5.3.6 Prism imbalance (relative prism error) for position-specific single-vision lenses and power-variation lenses

5.4 Requirements for thickness

5.5 Requirements for positioning

5.5.1 Multifocal lenses

5.5.2 Position-specific single-vision lenses and power-variation lenses

5.6 Orientation requirement for polarizing lenses

6 Verification methods

6.1 General

6.2 Verification method for back vertex power

6.3 Verification method for the direction of the cylinder axis

6.4 Verification method for addition power or variation power

6.4.1 General

6.4.2 Method for verification of addition power for multifocal lenses

6.4.3 Method for verification of variation power (including addition power) for power-variation lenses

6.5 Verification method for position and tilt

6.6 Verification method for prism imbalance (relative prism error) for mounted single-vision lenses (excluding position-specific single-vision lenses) and multifocal lenses

6.7 Verification method for planes of transmission of polarizing lenses

6.7.1 General

6.7.2 Apparatus

6.7.3 Procedure

6.8 Inspection method for material and surface quality

7 Marking for position-specific single-vision lenses and power-variation lenses

7.1 Permanent marking

7.2 Optional non-permanent marking

8 Recommendations on mounting

9 Identification

10 Reference to this document

Annex A (informative) Material and surface quality

Annex B (informative) Recommendations on mounting

Annex C (informative) Alternative method for measuring prism imbalance (relative prism error) for mounted single-vision lenses (excluding position-specific single-vision lenses) and multifocal lenses

Bibliography

Appendix ZZ (normative) Variations to ISO 21987:2017 for Australia and New Zealand