ISO 21987:2017 Ophthalmic optics - Mounted spectacle lenses, 2017
- 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 [Go to Page]