Standard
Track updates
AS/NZS 21987:2019
[Current]Ophthalmic optics — Mounted spectacle lenses (ISO 21987:2017, MOD)
The objective of this Standard is to specify requirements and test methods for mounted spectacle lenses relative to the prescription order.
Published: 10/05/2019
Pages: 21
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 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
5.5.1.1 Vertical positions (or heights) of the segments
5.5.1.2 Horizontal position of the segments
5.5.1.3 Segment tilt for straight-top, curved-top and E-style segments
5.5.2 Position-specific single-vision lenses and power-variation lenses
5.5.2.1 Vertical position (or height) of the fitting point
5.5.2.2 Horizontal position of the fitting point
5.5.2.3 Alignment marking tilt
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
A.1 Assessment
A.2 Test method
Annex B
B.1 Appearance of lens pairs
B.1.1 Geometrical dimensions
B.1.2 Colour matching
B.2 Recommendations on mounting
B.2.1 Size and shape of lenses
B.2.2 Lenses with bevelled edges
B.2.3 Lenses for rimless and semi-rimless spectacle mounts
B.2.4 Mounting
B.2.5 Setting of round lenses
Annex C
C.1 Test method
C.2 Tolerances for the alternative method
C.3 Diagrammatic description of the alternative test method
Appendix ZZ
ZZ.1 Scope
ZZ.2 Variations
Bibliography
Cited references in this standard
[Current]
Ophthalmic optics - Spectacle lenses - Fundamental requirements for uncut finished lenses
[Current]
Ophthalmic optics - Uncut finished spectacle lenses - Part 2: Specifications for power-variation lenses
[Current]
Ophthalmic optics - Uncut finished spectacle lenses - Part 1: Specifications for single-vision and multifocal lenses
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