Accommodative Micro Fluctuations / Cilliary Spasm / Active Focus

AMF (Accommodative Micro Fluctuations)
Here is an interesting topic for us that probably relates to active focus. Focus fluctuates regularly with your heartbeat (0.5 D) as the visual system gets jiggled around by the pulse, and it is also is influenced by cognitive stress. When everything is working properly the micro fluctuations probably help your brain figure out how to focus on whatever you’re looking at.

What accommodation looks like when it works:

vs what happens with cilliary spasm…

https://www.pointsdevue.com/article/accommodative-micro-fluctuations-messages-ciliary-muscle

And of course as we all know here your choice of lenses for near work can make a big difference…

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Similar https://onlinelibrary.wiley.com/doi/10.1111/opo.12234

Interesting, it seems some people can’t get rid of spasm even with atropine. Like I am, since no spasm means difference in corneal vs total astigmatism.