I have a VERY slight astigmatism. I find that with higher end red dots it is usually barely noticeable unless the brightness is so high the dot blooms (like if it where on max brightness in a dark room) so typically Aimpoints and the like work fine. They way it was explained to me from someone...
Trijicon Accupoint, Steiner P4xi, Meopta ZD, : owned all three of these and the 1X was on point the PST Gen 2, Leupold VX6, Accupower, Meopta optika6 where all very close maybe 1.1 X you wouldn’t notice unless you where very close to something as a reference