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[OM] Spiral optics

Subject: [OM] Spiral optics
From: usher99--- via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Fri, 16 Feb 2024 22:38:00 +0000 (UTC)
Cc: "usher99@xxxxxxx" <usher99@xxxxxxx>
Someone in Bordeaux is thinking outside the box (something I tell our cat 
Othello never to do).   They used optical vortices to extend the depth of 
field.   I attached the paper as well.  This would have implications for 
contact lenses rather quickly and much more slowly for IOL's for cataract 
replacements.  I suspect spiral optics will be much better than diffractive 
optics for IOL's with fewer dysphotopsias and no problem with pupil sizes.  How 
the spiral lenses will compare to lenses using aberrations to extend dof is not 
clear.The no free lunch rule of optics dictates that contrast sensitivity at 
some spatial frequencies must suffer as one is still spreading finite photons 
over various focal distances.  Truly accommodating IOL's will still be superior 
in that respect. 


Seeing clearly, Mike

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