I have problems using other sights and old eyes too. Any red-dot helps but this one is better than the others I have tried/own. Adjustment is precise and easily felt and you do it with your fingers and not tools. The 30mm optics are a pleasure to use too. No 'bleeding' of the dot into a sort of smudge, clear, clean glass, retains its zero without needing to be removed for gun-cleaning.
I'm about to buy my second one. First is on my Ruger Charger .22 and the new one will replace the junk on top of my Ruger Hunter 22/45. I routinely shoot dime-sized patterns with the bipod-equipped Charger at 25 meters, nickel-size patterns with the hand-held 22/45 at 14 meters. In fact I need the 1MOA dot because 2MOA is bigger than the bullseyes I'm aiming at. And I could not find another 1MOA anywhere.
Can't vouch for larger calibers but the one I already own has worked like a champ through thousands of rounds of .22 ammo. Flawlessly. Now, if you excuse me, I need to place that order for my second such sight...
Pros: 1MOA is rare find. Works flawlessly.
Cons: Costs more than the cheap ones that didn't work.
This review was written in the old system and had content requirements that are different than reviews written today.