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      I am entering aspheric terms in the Insert Lens Element dialog, how are the parameters defined in the sag equation?

      Aspheric Terms - Insert Lens dialog

      The description of the terms in the sag equation is in the User's Manual (Lens Element section in Chapter 2) and Help (Geometry Commands > Lens Element > Surfaces). The variables in the Insert Lens Element dialog are defined as follows:
      • Curvature = 1/Radius
      • Aspheric surface equation - each aspheric surface type lists terms that are explained in the Help and User's Manual.