I've started to wonder if vision is one of the chief reasons I don't shoot as well as many guys in the milsurp section. I don't have any real instruction nor do I have close to the level of experience, so that's definitely a factor. But, I shoot two rifles with optics: my 10/22 and a 22-250. With the 22-250 at 100 yards my shots touch each other and I can cloverleaf them fairly regularly. I can't come close to that with irons. So, to some degree, I don't think my technique is extremely poor.
I have a -8.75 eye prescription which is the worst of anyone I know PLUS astigmatism PLUS cross eye dominant. My father's side also has a history of cataracts. So, I feel like I lost the genetic lottery. Nevertheless, my eyes are my eyes, and there's no use whining over something out of my control.
I've never shot a pistol with a dot before, but I kind of wonder how it would go.