Variable Focus FreeForm Lens 2020 RSIEW v4.pdf (1.09 MB)
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Variable focus machine vision lens without moving parts: freeform progressive eyeglasses for non-humans

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posted on 2020-05-22, 06:19 authored by Ronian SiewRonian Siew
These are slides created for the OSA Imaging and Applied Optics Congress for an online presentation on June 25th, 2020, 3:30 pm - 3:45 pm, Pacific Daylight Time (session title: Imaging and Display Optics I).

(1) This is an extension of the work done at the following link:
(2) Rev. 4 is the latest.
(3) Previous revisions: Rev. 1 was the very first draft, with less slides. Rev. 2 had more slides, but some typographical errors. Rev. 3 had extra slides and did not have a note about the asymmetry of the term Ayx^2.
(4) The equation for surface sag uses the additional term "Ayx^2", which corrects astigmatism by controlling focus for sagittal rays BUT ONLY FOR THE +y DIRECTION of the aperture stop. For the -y direction, the coefficient A must change sign to negative in some smooth fashion.
(5) An OSA Proceedings paper is published at: