l can independently make my eyes dilate one at a time, regardless of lighting. It is sort of feels like a muscle in my eye. how can l do this and is this dangerous. l also have astigmatism in both my eyes could this have any effect?

That is interesting. How do you do it? It is not dangerous. Astigmatism has nothing to do with it.

l can do the same thing. Almost feels like l am widening my eyes but keeping the muscles in my flesh still, only moving my eyes. Everything goes out of focus but my pupils definitely dilate. l can do the same with a lot of different parts that most people can not control.
Try your epiglottis and all the little individual muscles in your body and see if you can control them in sequence.
l think it is all about awareness.
! l am not alone! !