AS/NZS 21987:2019
Ophthalmic optics – Mounted spectacle lenses
This standard specifies the requirements and test methods for mounted spectacle lenses relative to the prescription order. This standard is an adoption with national modifications, and has been reproduced from, ISO 21987:2017 Ophthalmic optics - Mounted spectacle lenses. Appendix ZZ lists the variations to ISO 21987:2017 for the application of this Standard in Australia and New Zealand.
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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
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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
Previous versions
AS/NZS 21987:2019
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.