There are opticians and opthamologists who work with shooters -- or if you can explain your needs, your current provider can work with you -- to fit you with lenses that really make a difference.
For a number of years, my optician gave me a pair of glasses that allowed me to use the left lens (my weak eye) to see distant things, and a right lens that was set to make the area near the front sight clear. Seeing the front sight clearly was better than seeing the target clearly, but artfully switching eyes gave me the desired results.
IT was great until I got a cataract in my left eye -- and it took a while for that to be resolved. Now I've got a pair of glasses that gives me a "middle view" that works pretty well: I can see the from sight fairly clearly, and see the target (but not crisply). It's not as good as having a 25 year old's vision, but it beats throwing the gun.
Talk to your optomotrist, optician or Opthamologist, and tell they what you want done. It doesn't have to be terribly expensive to get on target.