EN ISO 21987:2017

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Verification methods
7 Marking for position-specific single-vision
  lenses and power-variation lenses
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
Annex ZA (informative) - Relationship between this
         document and the Essential Requirements of
         Directive 93/42/EEC [OJ L 169] aimed to be
         covered