This document specifies rules for indicating the tolerance for surface form deviation, in the ISO 10110 series, which standardizes drawing indications for optical elements and systems.

NOTE            The terminology of interferometry employing the unit “fringe spacings” is widely used for the specification of tolerances. However, the usage of non-interferometric methods for testing of optical parts has recently become more important. Therefore, unlike in the earlier versions of this document, nanometres are now the preferred and standard unit to express surface form deviations. The usage of fringe spacings is still permitted, provided that the base wavelength is explicitly stated.

This document applies to surfaces of plano, spherical, aspheric, cylindric, and toric form as well as to surfaces of other non-spherical shape such as generally described surfaces. It also applies to the substrates of diffractive surfaces; for transmitted or reflected wavefront specifications see ISO 10110-16 and ISO 10110-14.