Hi,
My first optic is a 2 MOA green dot in a 32 MOA circle. This mode works for me.
View attachment 78115
I wear bifocals too but don't need any corrective lenses to see this optic, Holosun HE507C-GR X2.
View attachment 78116
Sure, it might not be the best dot, but for my first foray into optics pistols (XD9 Mod.3) it's getting the job done for now. It's easy to see and easy to pick up from the draw. I've had cataract surgery on my right eye, and I'm right eye dominant.
I have a Hex Wasp micro red dot (3.5 MOA), free from the "gear-up" promotion, ready to install on my Echelon 4.5F Comp but I haven't taken the time yet. I want to "shoot the new" off of it first, before I start tinkering with it.

Besides, I agree with all these learned fellows when they say green is easier to see. I'm looking forward to your adventure.
Thank you for your indulgence,
BassCliff