This standard is sometimes referred to as the “Scratch and Dig Standard.” It establishes uniform practices for stating, interpreting, and inspecting surface imperfections of many different types – scratches, digs, chips, fractures, and others – for transmissive and reflective optical elements and assemblies. This standard provides two alternative notations for specifying surface imperfections. A numerical notation indicates the allowable visibility of surface imperfections under specific viewing conditions. An alphabetic notation indicates the allowable size of surface imperfections. It is the responsibility of the optical engineer to choose which notation to use. This standard does not address the impact of imperfections on element or system performance.

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