I am a retired optometrist who has shot benchrest, now f class and prs, very little pistol. Regardless of age, a person can focus at only one distance at a time. So, on a pistol, the pistol sights must be focused and aligned, and this will always leave the target blurred; it has to. As we age we All lose the ability to 'accommodate'/focus on near objects. I find that wearing a pair of reading glasses is all I need for pistol shooting, power based on age, where the distance to pistol sights at arms length is about 16 inches, and that is where a +2.50 will focus. The weaker the reading glasses are, the less blurred the target will be. In PRS matches, there can be quite a number of turret changes, plus variations in lighting, so what works for me is a pair of bifocal shooting glasses. Sometimes I will buy the shooting glasses and add the press-on bifocal segs, in a +3.00, since the turret is about 13 inches away from my eye; I will position them high enough so minimal head movement is required. I have heard of shooters placing them 'upside down' on the lenses.
So for those wearing CLs or had Lasik with a distance only correction, these systems could work: readers for pistol, bifocals for rifle. I could try to address specific situations if you like. BTW, another issue I have seen mentioned is a shooter seeing a double image or ghost image, especially when looking at the reticle. Quite often this is a result of an uncorrected astigmatism(a refractive error) in the prescription. You'll need to seek out a professional to fix that one.
Another option for CL wearers is monovision, one eye for distance the other for near. Many like this system, tho you lose depth perception.
