One problem with red dot sights... is people buy cheap sights and all they see is a big star or a dot with a halo around it. So they put down ALL red dot sights. NOT true. I find it really funny, that people will lay out over $1,500 or $1,600, $2000, then...buy a $75 red dot and complain..!
To start with, buy a quality sight. You normally get what you pay for in this case.
1. Holosun, Leupold DeltaPoint Pro, Trijicon MRO, Steiner DRS1X and Txxx series. Even the Burris and Vortex are marginally, ok. A bit of a crapshoot, model wise.
2. Keep the brightness LOW... Only turn the dot / ring dot, brightness up until you can barely see it during your shooting.
3. The green dot, over the red sights are helpful too.
4. LOOK AT THE TARGET, not the retical.
I'm old... almost 71. I've bought a lot of sights, and done a lot of experimenting to get past MY astigmatism and bifocal use. The Prism (like the Steiner) type sights work well too.
Even the Holographic sights that are supposed to be bad with the astigmatism work...with the intensity turned down. I've got an EOTech 512 on one gun. YES, the red is blown out IF...the intensity is turned up ! IF...you keep it low, so you can "just" see the reticle...it works fine..!
Mike
P.S. - Stick with the 2 or 3 minute dot size. Anthing larger, you'll be disappointed. If you need a larger dot for a much longer distance, get a scope. Red dot sights are better for 50 yrds. and under.