What Sniper is talking about is a Specialty Super Peep with a Verifier lens. There is also a lens called a Clarifier, but this is for use with scopes. Your local shop may have these so you can try them. There are four different diopters so try them.

When you say your eyes are fine does that mean you can see well ata distance but have trouble close up? Like maybe you're at the point of using bifocals? This is where the Verifier lens works wonders.

And also as Sniper siad, it's pyhsically impossible for the eys to focus on two points at the same time that are not located the same distance from the eyes. One or the other has to be blurry.