Sounds like you have presbyopia - that's a fancy term for what often happens as we get older where you are nearsighted but also can't focus up close. With glasses the typical solution is bifocals.
A couple years ago I was considering getting Lasik done. My doctor recommends monovision, and he suggested I try it out with contacts for a while. I suggest you do the same before you commit to any permanent change to your eyes. What I have found is that monovision is a 85-90% solution for me. Most of the time I am perfectly happy with monovision, but there are times when I can't deal with it and go back to glasses. YMMV, big time. I know many people who are very happy with monovision.
Now, about shooting and monovision. I am right eye dominant/right handed. I generally shoot with both eyes open. In my case we started with my right/dominant eye corrected for distance (typical monovision setup). I was finding that I was not able to get a crisp sight picture with my monovision contacts. I talked with my doctor about that and we switched to a bifocal contact in my dominant eye that gives me a little better near vision in that eye (funny story for another time about me sitting in the chair at the eye doctor's using a prop gun to test out different contact options). It works acceptably well now for shooting, but I still get a better sight picture with my glasses.
We've taken some firearms training from a guy who is a very experienced shooter, a LEO, who has monovision. His advice is to get your dominant eye corrected for near vision if you do monovision Lasik. So that is backwards from what they normally do. Just one opinion.
I think this is greatly dependent on your vision. To some extent with monovision both eyes end up being corrected to some compromise level. My doctor tells me its common to have some mid-range distances where you can't focus completely well. I definitely have found that to be the case. For most activities that isn't a problem. I am fine reading or sitting in front of the computer, and just walking around where I am mostly dealing with distance vision I have no problem. But, there are certain activities I do where those mid range distances are important, and my front sight happens to fall in that range. You can sacrifice a bit of visual acuity at either near or far to get better mid range vision, but then it like I said it ends up being a compromise.
I'm probably rambling here, but suffice to say I strongly recommend you use contacts to mimic whatever you are planning to do with Lasik before you commit to the permanent solution.
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