Tinker, my eye sight is not what it was but I don't have astigmatism. This I think would make most sights a bit blurry. Most people put Aimpoints in the same dot sight area as others. They are slightly different. They have asymmetrical, I think it is called, Lenses. This means that when zeroed it does not matter if the dot appears to be in say, the top right hand part of the sight, if it is on target it is on. Probably one reason I do not have to hunt to find the dot like I do with any other brand or type of dot sight. With the Aimpoint you are not looking for the dot you look through the scope focusing on the hit area and the dot is there.

The other problems with a Red dot sight is if a person is red/green colour blind. I am told the dot appears as a grey smudge/dot. Also, I have been told, some dot sights wash out with any degree of sunlight directly on the front lens. IE facing a setting sun with less than 3 hours before sunset.

A problem with open sights for me now is I cant see them unless they are very big and then they are blurry. Plays havoc with pistol shooting. I either have to just sight using the flat top of the slide as the sight. ie. make sure it is pointing straight at the target or use glasses that allow me to see the front sight but even targets at ten meters are just a blurred outline. Getting old sucks:-)

I know some have artificial lens placed in their eye to replace damaged/crook eye lenses. I don't know if that sort of surgery is wanted/would work for you.

The 3 fastest sights I have used are Aimpoint, some open/peep sights, Trijacon 1.5-4X24 picket post Accupoints on 1.5 power. Nothing else comes close for me. May I suggest you have have a look through one of the Trijacon Accupoints 1-4X24. These are not quite as for giving as the old 1.5's as their eye box is not as big.

I wish you the best of luck in finding a sighting option that works for you.