My glasses are the same as Dogtired mentioned above. I think it's called monovision, right eye corrected to front pistol sight, left eye for distance. I have an Eotech on the rifle and it's worked well out to 300 yards. I did try an upper bifocal once for the pistol, along with the normal lower bifocal, when I brought up the pistol I'd see three sets of sights. Gave up on that idea.