On one hand, with the "proper setup", a red dot and an astigmatism "can" work.
Been there, I have the dreaded astigmatism, and...most of my guns, have...red dot sights !!
On the other hand , DON'T forget the "prism" sights. They are kind of a cross between a red dot, and a scope. You have an astigmatism...the Prism sight doesn't care ! Once you set the clarity by adjusting the first lens, the reticle is as clear as ANYTHING youll ever see !
You can buy them in several multiplications, I've seen 1x, 3x and 5x. There may be others.
Price, just like the sight, between a quality red dot, and a cheaper scope.
Then there is the scope.
Like I said above, most of my guns (both pistol and rifle) have quality red dot sights. BUT...more and more, some of my guns have been swapped to a "prism" sight. One of the best things about the prism, while they all have lit up reticle, you don't NEED a battery. Just like an old fashioned scope, the retical is black !! So if you like colored recitals, yeah, you'll need batteries. But...you don't need...them, to use the sight.
Mike