This International Standard defines basic terms relating to ophthalmic optics@ specifically to semifinished spectacle lens blanks@ finished spectacle lenses and fitting purposes. Terms relating to processes and material for fabrication and surface treatment (other than some specific terms relating to coatings@ which are defined in Clause 16) and terms relating to defects in materials and after optical processing are given in ISO 9802. NOTE 1 At the time of publication@ definitions quoted and acknowledged as being sourced from other International Standards are identical to those in the referenced editions of these documents (see Clause 2 and Bibliography@ respectively). If@ due to future revision of these International Standards@ there should be disagreement between definitions in these International Standards and those in ISO 13666@ then the definitions in the latest versions of the referenced documents take precedence. NOTE 2 In addition to terms and definitions used in the three official ISO languages (English@ French and Russian)@ this International Standard gives the equivalent terms and definitions in the German language; these are published under the responsibility of the member body for Germany (DIN). However@ only the terms and definitions given in the official languages can be considered as ISO terms and definitions.