[Leica] Chromatic aberration/fringing in spectacles?

[len-1 at comcast.net (Leonard Taupier)]

Peter,

I never saw anything like that. I have been using progressive lenses  
for about 15 years now. That is with 3 different prescriptions. If it  
were me I would change them out. It's bad enough I see CA in photos  
from time to time without seeing it all the time. The only problem I  
have is distortion while putting on the golf course. I've tried  
single lenses just for golf but that doesn't work at all.

Good luck,
Len


On Jul 1, 2008, at 12:27 AM, Peter Klein wrote:

> Optometrists or anyone who knows the subject:  I just go a new pair  
> of bifocals. The distance prescription seems great.  But the  
> reading lenses do something I've never experienced before.  When  
> the  gave me a newspaper to check how I felt when reading, the  
> contrast of the letters appeared noticeably lower my old glasses.  
> Then I realized that large black letters had color fringing. I  
> looked at a square picture which was mostly black, and I saw a  
> reddish-amber fringe at the top, and a blue fringe at the bottom.   
> Huh?
>
> The young guy fitting my glasses (a technician, not the optometrist  
> who does my eye exam) first met my observation with silence. After  
> I insisted several times that I was seeing the color fringes, he  
> said that it might just be that I was not used to the new  
> prescription, and the fringing would go away in time.  But he also  
> said that because I got a frame that had no bottom wire, they had  
> to use polycarbonate lenses rather than the generic optical plastic  
> I'd had on my previous glasses, and this has slightly less good  
> optical properties. He said that they could upgrade the lenses to a  
> better material for about $30.  But he advised me to keep them for  
> a couple of weeks first and see how I felt then.
>
>   The lighting at the optometrist's was a mixture of sunlight and  
> incandescent light.  At home under tungsten light,  I am seeing the  
> same fringing on black bars or squares on white paper. The fringes  
> are always horizontal lines, not vertical. The fringing doesn't  
> happen without glasses, or with my old glasses. Possible  
> confounding factor: It was very hot in Sunday night, and I got very  
> little sleep.
>
> Has anyone else ever seen this color fringing with spectacles? Any  
> advice?
>
> --Peter
>
>
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