When I wear the right glasses down to the pistol range I can see the sights pretty well but the target is fuzzier with the glasses vs. no glasses. With no glasses the target is pretty clear and the front sight is invisible to me.
I'm not 100% confident I will always have my glasses on so I can see the front sight when I need to. Glasses fall off, get knocked off, get broken, etc.
I have an RMR on my EDC P07. With my glasses (reading or driving) the dot is pretty clear. Without my glasses the dot is fuzzy. I know, from shooting it that way, that I can put a fuzzy dot on a clear target. When I can't see the front sight at all, I can see that fuzzy dot.
I will, once I settle on a pistol to carry around the yard, garage, back lot while doing outside stuff, working on cars, etc. have a red dot installed on the pistol that wins the reliability/accuracy testing. The M&P has fallen by the wayside due to poor accuracy. The CZ75B .40 could be it, but man, it's so pretty I hate to gouge/scratch it up crawling around in the dirt/gravel, etc. The XD45 is still in the running, too. The FNS Long Slide groups look good, but the trigger could be an issue (may be too different from a standard hammer or striker fired pistol) due to moving back and forth from the P07 to it.
I probably should have just bought another P07.
Once again, in case anyone lost my opinion/experience in this long reply - get a good red dot installed on your EDC pistol.
Here's mine. Works like a champ. Primary Machine did the milling, cerakoting, front/rear sight installation and screwed the DI RMR to the slide for me.
When I'm testing the newer/non CZ pistols and getting PO's at the results (and wondering if it's me having a bad day) I pull the P07 out of the IWB holster and shoot a group with it. It usually makes me feel better (it's not me, it's the new pistol/ammo).
This is not the best group the P07 will shoot for me, but it's a good example.