How do they do it?

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wally

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Over the last ten years I've had Lasik mono-vision and a couple of tweaks, in a nut shell I started right (dominant eye) seeing near, with the left eye far in Jan 2008. It eventually became nothing in focus with the left eye and right eye far, but the initial Lasik got me almost five more years of being able to use irons sights at least well enough to be fun.

I had the left eye tweaked in 2013 so it had near vision and right eye remained far -- iron sights were pretty much useless since then. But my walking around vision was fantastic only needing reading glasses for long sessions at the computer or very close work -- I've a set of bifocal safety glasses in varying diopters for when I use my milling machine etc.

But the right eye slowly changed until its not in focus at any distance, so last month I had the right eye tweaked to be near again -- its a joy to be able use iron sights again, a lot of old friends without optics are coming our of the safe :)

To get to the question in the title, over this time period I've had the diopters on my rifle scopes, binoculars, & SLR cameras adjusted to about their +/- limits to get the reticle in focus as my vision has shifted.

Except for my Russion PSOP style scopes, they lack a diopter adjustment yet the reticle has always been clear to me when I look through them. With my latest right eye correction I've had to crank my scopes adjustment fromabout two+ turns out, to in about as far as it would go to compensate. I expected the Russian scopes to now be useless to me but I was shocked to find the reticle still clear. I can't understand how they are optically doing this.

The contrast is better when I look through it with my "far" left eye (this could be because my right eye is still not completely healed), but it is clear enough when I look through it with my newly made to see "near" right eye that I can clearly resolve the "windage tics" and drop compensating chevrons, whereas I couldn't resolve the mil-dot or BDC tics on my other scopes until I cranked on the diopter.

I sure wish my SLR cameras were made this way.
 
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