You guys talking about Peeps got me to thinking about Pin-Hole Diopter Viewing and shooting...
You can make a small hole with your thumb and forefinger (Tight OK sign) and look through it to see it for yourself while sitting at your desk without glasses.
Then I remembered that Pro Shooters use it in competition and ran across this article.
Below is just a small piece of it talking about the Pin-Hole.
Pin-Hole Diopter Shooting
by Don Depew (Drinking Buffalo)
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Old shooters never die - their vision just fades away.
It's a fact of life that beyond the age of 40 a person's eyes just can't focus on things as close as his rifle and pistol sights anymore. The condition gets worse and worse as you get older - and it happens to everybody. But you still want to shoot, even competitively, and against those young guys with their young eyes too.
So what can you do? Telescopes work fine, of course, if you're into modern, or slug gun shooting. Peep sights aren't bad, if you're into bench or buffalo. But how do you continue to see those open sights on your offhand gun, or your flintlock, or your pistols? Well, here are some things you can and should do. Try them all and you will be amazed by how well they work. They shouldn't cost you an arm and a leg, either.
The simplest and probably the most significant thing you can do is to use a pin-hole device on your shooting glasses. This will sharpen the focus of objects at every distance. You can buy these, of course, but don't do that. Just use a small piece of black plastic electrician's tape with a 1/16 inch hole punched in it (the smallest size punch of a common leather punch). Pieces of tape no bigger than about 1/4-inch square work fine. Don't make the hole too small, or diffraction effects will make things fuzzy.
Cut a few snips of the tape, punch a hole in each one, and keep them stuck to something inside your shooting pouch, like the top of a cap box. Then if you need a new one, it's all ready to peel off and stick onto your glasses. And that's all you do, just stick it onto your glasses, up in the inner corner for rifle shooting, and more centered but still high up for pistol shooting. If you use small pieces of tape, you can have both stuck onto your shooting glasses at the same time. They don't even get in the way for normal vision.
Sorry for the Hijack...
-gus