The result of a lens optimization is critically dependent on the choice of the initial design, and this paper discusses ways in which starting points for optimization can be generated. Examples will be given showing how, in some cases, an optimization program can obtain results that are very different from the initial design. In other cases, the choice of the initial design severely restricts the potentiality for optimization, and this is also discussed.
Michael J. Kidger,
"Generation of lens designs for optimization", Proc. SPIE 1781, Specification and Measurement of Optical Systems, (1 January 1993); doi: 10.1117/12.140996; http://dx.doi.org/10.1117/12.140996