Since the topic has been brought up:
For those with astigmatism, which pistol red dots have you found to have the most crisp reticle? Has red or green made a difference?
Of the ones I have, the reticle that is most clear, is the Sig Romeo Zero Elite. Awesome reticle, too bad everything else about it sucks. Green has been no better (or worse) than red for me. All dots are more blob shaped that circular to my eyes.
I wear progressive bi-focal glasses; pretty much all of the time that I'm not in bed, in the shower, or exercising. I have two pairs, one's clear and the other's "sunglasses".
When I had them made, I made very clear to my doctor my specific needs. I sit in front of a computer all day at work, I shoot handguns and I ride a motorcyle. I need vision with appropriate focal points and eye protection.
I have Trijicon SRO's on my IDPA/USPSA/SC G34 and G17. I have Trijicon RMRs on my G31 carry gun and my G41 pin gun, (the one on the G41 can be swapped to the G31 in emergency; I would prefer an SRO on the pin gun, but I wanted a backup RMR - and they're too expensive to just have one sitting around). I'm very happy with the dots on these guns. If I take my glasses off, I see a "bar" made up of closely spaced dots rather than a single dot, but it's still usable at close range.
I have Burris FastFire III's on a couple of my .22's and they work fine, just not as durable as the Trijicons.
I'm red/green colorblind, I've stayed away from green because I'm pretty sure it will get lost against a dirt/tree background.
Anyone who's got vision issues should see a competent eye doctor - and clearly articulate their needs. My eye doctor is a member of my local range. My PCP is too, and so's my dentist.