FWIW.............
Dr. Bill Schlichtemeier specializes in Lasik eye surgery in the Omaha area. He's also been an International Olympics Competition Shooter and currently shoots out of the Weeping Water Gun Club.
If you've watched ordinary bifocal handgun shooters, you've seen them shoot with their heads drawn back and--usually--with their mouths open. Which is a pretty un-natural shooting stance. Not to mention kinda ugly.
Dr. S prescribed for me a set of bifocal glasses with the farsighted lens at the top, not the bottom, of the shooting eye side (right hand, for me). The bifocal-on-top arrangement allows the handgun shooter to use the normal forward body-and-head lean into the sights, rather than tilting back away from them.
This setup brings both front and rear sights on my handguns into sharp, clear focus. Now--at the same time, the actual target downrange is Really Fuzzy. But--all you gotta do is shoot into the middle of the fuzz.
Works pretty darn good.