BS ISO 9211-1:2018,Optics and photonics – Optical coatings – Vocabulary.BS ISO 9211-1:2018 pdf free download here.
The optical properties of a coated surface are characterized by spectrophotometric values. These values
relate to the energy transported by electromagnetic waves ( radiant or luminous) and they vary as a
function of the wavelength, the angle of incidence, and the state of polarization. Additional influences
can be caused by scattering.
A surface for visual applications can be characterized by colorimetric parameters. These depend on he reference illumination source, the reference observer, and the optical properties of the surface Colorimetric parameters are not part of this standard.
Examples of coating imperfections are given in Annex A. Test methods for the surface imperfections are described in ISO 14997.
BS ISO 9211-1:2018 defines terms relevant to optical coatings. These terms are grouped in four classes: Terms and definitions, definition of coatings by function, definitions of common coating imperfections and other definitions.

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