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#192048 - 04/22/18 02:04 PM CHANGE OF PRESCRIPTION = CHANGE IN POI?
45MAN
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Registered: 08/13/17
Posts: 956
Loc: brownsville, texas

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WENT TO MY SHOOTING RANGE IN NO MAN'S LAND (BETWEEN THE RIO GRANDE AND A BORDER FENCE) TODAY. WAS SHOOTING OPEN SIGHT REVOLVERS (22LR, 327 AND 45 COLT) USING NEW GLASSES WITH AN UPDATED (STRONGER) PRESCRIPTION. MY OLD SHOOTING GLASSES ARE AMBER IN TINT AND JUST HAVE THE DISTANCE, NOT READING, PRESCRIPTION. THE NEW GLASSES HAVE A BROWN TINT AND ARE ALSO ONLY DISTANCE. IT WAS OVERCAST AND I SHUD HAVE BEEN SHOOTING A LITTLE LOW ("LOW SKY SHOOT LOW, HIGH SKY SHOOT HIGH") BUT I WAS SHOOTING HIGH WITH ALL 3 REVOLVERS. SO WHAT WAS GOING ON? DO WE NEED TO RE-SIGHT IN WHENEVER WE CHANGE OUR LENS PRESCRIPTIONS?
_________________________
"ADAPT OR DIE". I USE ALL CAPS, NOT BECAUSE I AM YELLING, BUT BECAUSE IT IS AN OLD HABIT FROM MY ARMY DAYS, PLUS IT IS EASIER TO TYPE AND READ.

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#192065 - 04/22/18 10:06 PM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: 45MAN]
wvhitman
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Registered: 12/04/05
Posts: 816
Loc: WV

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I had a little trouble with that years ago, but not much. What I do now is I get Zeiss progressive lenses in all my glasses (yellow, transitions, and regular). They have the bifocal in the bottom and far vision in the top, BUT buy raising and lowering my head slightly open sights of different guns come in focus somewhere in that range, because they "progressively" go from bifocal to far vision Recommended by my local glasses guy, and it works extremely well for last 15+ years.

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#192073 - 04/23/18 07:23 AM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: wvhitman]
45MAN
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Registered: 08/13/17
Posts: 956
Loc: brownsville, texas

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DOC: THE SIGHT PICTURE WITH THE NEW LENSES IS VERY CLEAR, SO NOT SURE THE PROGRESSIVES WOULD SOLVE MY PROBLEM. I DO HAVE SOME CLEAR PROGRESSIVES WITH THE NEW PRESCRIPTIONS, MAY GIVE THEM A TRY JUST TO SEE IF IT MAKES ANY DIFFERENCE. WHERE DO YOU GET THE ZEISS PROGRESSIVE LENSES?
_________________________
"ADAPT OR DIE". I USE ALL CAPS, NOT BECAUSE I AM YELLING, BUT BECAUSE IT IS AN OLD HABIT FROM MY ARMY DAYS, PLUS IT IS EASIER TO TYPE AND READ.

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#192080 - 04/23/18 11:27 AM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: 45MAN]
Hawkeye
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Registered: 01/18/04
Posts: 727
Loc: Oklahoma

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I have the Zeiss Progressive Lense in my glasses. Just had to ask the Eye Doctor to put them in my glasses. They are more but are nice. Not all places that make lenses carry that glass.

Mike
_________________________
You don't quit playing because you get old, You get old because you quit playing.

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#192088 - 04/23/18 04:25 PM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: 45MAN]
98Redline
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Registered: 10/10/10
Posts: 649
Loc: Eastern PA

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A POI shift from changing lenses is completely reasonable.

A change of the curvature of the lens and/or a change in the refractive index of the lens material could easily cause your sight picture to look a bit different, particularly if you lens is not completely square to the sight.

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#192092 - 04/23/18 06:46 PM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: 98Redline]
Walkingthemup
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Registered: 10/01/05
Posts: 450
Loc: this side of the black stump

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Ditto to 98Redline. Also take into account that the optical centre of the lens is designed to be the part your eye looks through when in a natural position. Any tilt or craning of the neck while taking up a sight picture will mean the eye is slightly off the lens optical centre and therefore subject to different refraction. No big deal if its always consistent, but may require re-zeroing your gun when using new glasses.

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#192093 - 04/23/18 08:09 PM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: Walkingthemup]
wvhitman
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Registered: 12/04/05
Posts: 816
Loc: WV

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Rey, my local optician in the boondocks orders them readily. He's never had a problem getting them. I get them back in 10 days. Don't know if he has to do anything special.

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#192114 - 04/24/18 10:41 PM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: wvhitman]
spinsail
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Registered: 03/13/17
Posts: 189
Loc: SC

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If you are only going to get one pair, what color of tint would be most versatile?

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#192115 - 04/24/18 11:10 PM Re: CHANGE OF PRESCRIPTION = CHANGE IN POI? [Re: spinsail]
45MAN
old hand


Registered: 08/13/17
Posts: 956
Loc: brownsville, texas

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I REALLY LIKE THE YELLOW/AMBER TYPE TINT BUT IT WAS NOT AVAILABLE TO ME AT THE VA CLINIC WHERE I BOUGHT MY NEW GLASSES. GOING TO TRY TO GET SOME FROM PRIVATE SUPPLIERS.
_________________________
"ADAPT OR DIE". I USE ALL CAPS, NOT BECAUSE I AM YELLING, BUT BECAUSE IT IS AN OLD HABIT FROM MY ARMY DAYS, PLUS IT IS EASIER TO TYPE AND READ.

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