Written by Scott Sparrold ρ = aperture distance R = Optical surface radius of curvature This is an approximation and is valid for R>>ρ. The exact equation for reference is An asphere takes the spherical equation and add even ordered polynominal terms (ρ^2n) I have not included a ρ^2 term, because it repeats or competes with the radius of curvature, R, and conic, K. K = conic constant C _{N} = aspheric coefficientThis aspheric equation lends no intuitive understanding of manufacturability. See Greg Forbes work to see recent advancements in optical engineering! |

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