In my preceding post, above, I offered a qualified response to this. Unfortunately, many free-form lens manufacturers out there are not particularly forthcoming with the details of their lens design technology, so it may be difficult to say whether any two given free-form SV lenses should perform similarly or not.But Zeiss as well as Hoya have FF designs that don't allow as much freedom to user-define base curve, which is in keeping within their design performance goals. I think that, for most Rxs, the differences between SV designs are far less significant to the wearer than one might think. Darryl, I welcome your input herre.
Sure. Although, since chromatic aberration cannot really be significantly reduced by the lens design, you don't necessarily need to include a correction term for it directly in the calculations, as long as you choose a merit or optimization function that minimizes the monochromatic aberration that contributes most to the interaction between the monochromatic and chromatic aberrations.Optimal lens recipes MUST include Abbe to be fully inclusive of all optical degradation factors. This, of course, is left out of all this talk in the differences between lens design optimizations. Also, as Rxs amplitudes climb, representative personalized measurements also become important
For instance, while designing the Tillyer Masterpiece lens for American Optical, John Davis devised a merit function that included a lateral chromatic aberration term. He called this function a "blur index." However, you could get the same lens design result by simply minimizing the monochromatic tangential error of the lens.
Best regards,
Darryl
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