ISO 10110 specifies the presentation of design and functional requirements for optical elements and systems in technical drawings used for manufacturing and inspection. This part of ISO 10110 specifies rules for indicating the tolerance for surface form. NOTE 1 The terminology of interferometry is used for the specification of tolerances and, in particular, for the units in which the tolerances are to be specified; however, this does not stipulate that only interferometric methods may be used for the actual testing of optical parts. Other non-interferometric methods may be used if the results are converted to the units specified here. This part of ISO 10110 applies to surfaces of both spherical and aspheric form. NOTE 2 ISO 10110-12 allows the surface form tolerance for aspheric surfaces to be specified without reference to this part of ISO 10110.