I discovered that the reading glasses fix works for me several years ago. 1.5 reading glasses make handgun or long gun sights nice and clear, and I can also see the target clearly. Probably doesn't work for everyone, but it's worth experimenting to see what you can come up with.
If that doesn't work, try using whatever corrective vision you need to see the target clearly, and a good, bright green laser. Even compared to the reading glasses and no blurry vision issues, the green laser cuts my handgun groups in approximately half. Here's 15 rounds from my CZ 75 P-01 with Green Crimson Trace CMR-203 laser at 11 yards. With irons, my groupings are approximately 2x this size.
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The P-01 is the top right gun in this photo:
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