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Eye Master
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0.50 or 0.75 is what you add to your distance vision.

If you have good distance vision, you need zero correction for distance, so you just use the 0.50 or 0.75.

If you have a distance correction, either plus (farsighted) or minus (nearsighted), you would add the 0.50 or 0.75. You can do this either by adding the mathematical values to make a new lens, or else you can stack two lenses, by putting your distance vision in eyeglasses, and putting the 0.50 in the hood of the rear sight. Optically, those solutions are equivalent.

The corrections I am recommending are conceptually just like reading glasses, except much less powerful. Your 2.5 reading glasses will focus you at 1/2.5 meters, or 40cm, about 16" away. THe 0.50 I recommend will focus you at 2 meters, which is between the front sight and the target.
 

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0.50 or 0.75 is what you add to your distance vision.

If you have good distance vision, you need zero correction for distance, so you just use the 0.50 or 0.75.

If you have a distance correction, either plus (farsighted) or minus (nearsighted), you would add the 0.50 or 0.75. You can do this either by adding the mathematical values to make a new lens, or else you can stack two lenses, by putting your distance vision in eyeglasses, and putting the 0.50 in the hood of the rear sight. Optically, those solutions are equivalent.

The corrections I am recommending are conceptually just like reading glasses, except much less powerful. Your 2.5 reading glasses will focus you at 1/2.5 meters, or 40cm, about 16" away. THe 0.50 I recommend will focus you at 2 meters, which is between the front sight and the target.
Thank you
 

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Discussion Starter · #23 ·
I'm thinking of trying the single power glasses initially, maybe for pistol and longer rifle lengths, not too big an investment and it will help me feel more comfortable about getting a custom type insert or glasses = less concern about buying a custom item tht doesn't work from "my" provided specs.
 

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Discussion Starter · #24 ·
Had an exam this weekend and determined that while I thought I didn't need much if any distance correction, the reality is more complicated. But with a current exam, I have a foundation for approaching corrective solutions.
 

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Discussion Starter · #27 ·
Update. Got the glasses today from Zenni. The frame isn't quite what I expected - a little hard to tell size and appearance over the webz. I didn't notice a truly heavy duty frame on my first set of searches but these are larger lenses and not expecting a truly bad environment. I didn't get a shipping notice but had spent a little more for faster delivery and got them 2 day priority mail. Order date 8/26. Received 9/9 - 15 days. Went single visions, one the corrected suggested for shooting for the right eye and regular corrections, the left.

The corrections look good on handling both the M1a and AR, and pistols. Using either of the "peep" or ghost rings shows a definite "aperture" impact and clarity on down range (well, across the room) subjects compared to direct view. Some trouble capturing the right eye view through the sights with a strong left eye, so squinting (bad) or a light blur, as in tape, etc., on the left helps . Trying to view the AR's sights with a co-witnessed Aimpoint Pro is tough, any complicated or low contrast subject and I get more long left. OTOH, with the dot on, seems much less an issue.

Now, to the range. And that may be a couple of weeks. sigh.
 

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https://www.usconcealedcarry.com/sh...rR3VobGVuTTJpc3RyM1RoZEk3cUsyaWNVM3NHOD0ifQ==
http://shop.shootingsight.com/03A3-R...d-Aperture.htm

.047 reduced apertures for m1/m14 nm sight
http://shop.shootingsight.com/047-Ap...-Hood-Only.htm

1903 reduced aperture
http://shop.shootingsight.com/1903-R...d-Aperture.htm

http://shop.shootingsight.com/ apertures/lenses etc

Reduced Apertures M1 'as issued' JCG Match Legal
http://shop.shootingsight.com/Reduce...d-Aperture.htm

ar-15
http://www.bjonessights.com/AR15.html
http://shop.shootingsight.com/Reduce...d-Aperture.htm
http://ironsightoptics.com/ check here hooded sight refer question along with this link to ask cmp section.
http://www.midwayusa.com/Product/936...pter-optic-aid
http://bulletin.accurateshooter.com/...-aid-old-eyes/
http://pinhole-glasses.com/
http://www.meritcorporation.com/products.html
http://slingshotforum.com/topic/1275...oting-glasses/
http://www.bjonessights.com/SR.html not legal for john c garand match
http://www.ebay.com/sch/i.html?_from...apter&_sacat=0

http://www.eabco.net/Merit-Eyeglass-...e_p_13347.html
adjustable aperture that fits on lense.dial in sight picture.
you can get some cheap clip on glasses
http://www.ebay.com/sch/i.html?_odkw...fiers&_sacat=0 and put a clear plastic piece in this and screw the merit piece into it
http://www.odcmp.org/0111/StatementAimingAids.pdf


http://forums.thecmp.org/archive/index.php/t-32423.html
http://www.championshooters.com/inde...=17&Itemid=111 drill hole in this
http://www.ebay.com/itm/Gehmann-Clip...item567ee34fa2
http://www.championshooters.com/inde...=17&Itemid=111
 

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Without my glasses I can see my sights , but target is blurry.

With my glasses I can see the target clearly , but my sights are blurry!
 

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ShootingSight,

Is it possible to just get the proper distance script made up on everyday wear glasses, and then, while at the range, have a clip-on/slip on "add .5" and/or "add .75" lens to attach over your aiming eye lens of your glasses?
 

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Eye Master
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That works, and I do sell clip on +0.50 and +0.75 lenses for $50. I'll have to check, they might not even be on my website, because they are not big sellers - people normally just get the glasses made as single vision lenses. I know I have them in stock.

I'll add them to the website right away, though there might not be a picture.
 

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Discussion Starter · #37 ·
Sounds like another fairly inexpensive and practical approach. Still waiting for a chance to try the new glasses in real shooting. Spoke with a classmate who is an optometrist at HS reunion the other night and he was immediately familiar with the .5 and .75 adds and he has worked with some shooters using them. He's thinking of trying to get a CCW but lives in the Bay Area (norcal) so admits it may be a difficult proposition.

Would a .625 work reasonably well going either way? Or is the lens "grind" set up limited to the larger steps?
 

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Eye Master
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4,121 Posts
The human eye can typically discern steps as small as 0.125, so stock lenses are available in 1/4 diopter steps, because any lesn will be within +/- 0.125 of where you need to be.

So even if you did measure out at needing a 0.625, if someone gave you a 0.75, it would be questionable if you could tell the difference.

That, plus I'm not sure your distance vision correction is constant. Blood sugar levels will change the refractive index of your eye, so your 'theoretical' focus will drift slightly during the day. Hydration level will change your eye diameter slightly as you inflate/deflate with liquids, which will change your focal point subtly. So in the end, I'm not sure that trying to measure to the nearest 1/8 diopter is truly a meaningful exercise.
 
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