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ANSI/OEOSC OP1.0110-12-2014
Optics and Electro-Optical Instruments - Preparation of drawings for optical elements and systems - Part 12: Aspheric surfaces
This national standard establishes uniform practices for indications on drawings of aspheric optical surfaces. It is based entirely on ISO 10110-12, with the addition of a notation to allow the specification of Forbes aspheres, commonly called Qcon and Qbfs.
Optics and Electro-Optics Standards Council [oeosc]