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09/08/2004 05:11:16 PM · #1 |
OK..
I just got new glasses, and I swear I'm having a chromatic abberation thing happen. I keep telling the optician this and he's looking at me like I'm crazy!
You know,, brightly back lit object. high contrast and this annoying bright yellow/green "glow' around the object. Sound like CA to you?
If so,, is there any way you know of to prove it?
I'm totally grrrrrr'd out right now and at loss how to prove there is a problem with my lenses.
HELP!!!! |
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09/08/2004 05:12:47 PM · #2 |
tell him to look for himself.
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09/08/2004 05:24:55 PM · #3 |
| How 'bout taking a pic thru the lens & showing him that? |
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09/08/2004 05:40:45 PM · #4 |
Sounds like he is moon walking :)
Are they Glass lenses?
Message edited by author 2004-09-08 17:40:58.
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09/08/2004 05:44:59 PM · #5 |
Wasn't there a news story recently about a huge super fund site being found near San Antonio.... where exactly are you in relation to it?
;) |
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09/08/2004 05:47:28 PM · #6 |
| My brother had the same thing happen when he got a pair of glasses from Wal-Mart. They seemed to have more aberration at the edges even to the point of distortion right at the edge. He went to another eye doctor and the problem was solved. Is there a guarantee on the glasses? Get your money back. If you can. |
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09/08/2004 06:49:06 PM · #7 |
re: the super fund.. I'm no where near it!! lol
hmm, these are from Sears. and it is only at the top.. I think I'll take them to the doctor I got the prescription from and have him look at them..
damn.....
they are plastic lenses
yes, the distortion is only at the top.. where my distance prescription is.. I have tri-focals and the rest seems fine...
grrrrrrrrrrrrrr
Message edited by author 2004-09-08 18:49:35. |
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09/08/2004 08:38:55 PM · #8 |
All simple lenses cause some chromatic aberration, the amount depends on the focal length of the lens.
With shorter focal lengths (several diopters+) it is more noticeable than with longer positive focal lengths and those with negative diopter.
There is one exception: a negative meniscus lens can be made achromatic for visible range of wavelengths provided the lens is thick enough to accomodate the curvatures necessary.
The Maksutov telescope employs this achromatic feature in the front correcting (spherical aberration) element.
If you are farsighted the lenses are more likely to have noticeable chromatic aberration. |
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