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Post Info TOPIC: Keratoconus refraction problems - why does an irregular cornea cause bad vision?


Member

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Date: Mon Nov 21 6:26 PM, 2005
Keratoconus refraction problems - why does an irregular cornea cause bad vision?
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For those of you interested, I have written a simple explanation to why keratoconus affects our vision. I would love to have your comments, either here or in my blog. The url is: http://keratocon.us/?p=25

Magnus


PS. Administrators, feel free to move this post if it's in the wrong forum.

PS2. Am I the only one thinking that there might be too many top-level categories in this forum?

-- Edited by Magnus at 09:42, 2005-11-22

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Anonymous

Date: Mon Nov 21 8:48 PM, 2005
RE: A simple explanation of keratoconus
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Magnus, thanks for your post. I think this is a good section for it, the many top-level sections is a good thing, is it not? Our history (which started five years ago on the net) showed our "old friends" that this is the way to go, ...other stories ...other times... too much to go in to... but its known by the "old friends" ...



-- Edited by QuintriX at 05:51, 2005-11-22

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Executive

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Date: Mon Nov 21 11:10 PM, 2005
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Magnus,
your explanation is good but it concerns refraction problems caused by KC. I left a commentary in your blog. I think it is more "semi-chaotic" than "chaotic". Irregular surfaces scatter the light , do not refract it. Chaotic is scattering, when light goes all directions. What we get has some more structure for corneal surface is not irregular and rough but conic. In more advanced stages, it is probably irregular. That we should ask our doctors.
Anyway, The Explanation of KC should concern the question why the conus is formed, why the geometry of the cornea changes?
Best,
Y.

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yarsky
Anonymous

Date: Tue Nov 22 2:11 AM, 2005
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Yeah Magnus thats a mis-leading topic header... change it or i'll change it for you.


The pictures below shows what happens with light and a kc cone (even more simply)




-- Edited by QuintriX at 08:30, 2006-01-09

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Date: Tue Nov 22 9:50 AM, 2005
RE: Keratoconus refraction problems - why does an irregular cornea cause bad vision?
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What about that header? Do you like it better? Other suggestions? (When I find the correct one I'll change my blog as well.)

Yarsky, I agree with you. The semi-chaotic pattern of our corneas causes a semi-chaotic image. We see the world with certain abnormalities such as ghosting, glares etc. Whether to call it refraction or scatter is irrelevant. What you refer to as a scatter by a chaotic surface is actually the sum of a large abount of differing refractions. Refraction is after all defined as the bending a ray of light undergoes when entering one medium from another.

And QuintriX, the image you post shows the effect of KC, but doesn't explain why. When I read an explanation from a doctor on the KC-link, claiming that the distortion was caused by the time-difference from when light hits your cone and around the cone, I had to react

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Anonymous

Date: Tue Nov 22 12:13 PM, 2005
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hi magnus,

In advanced cases, the cone moves the focal point which over-all thows out focusing of the image on the retina as seen, this is also at play depending on the the cone.

Topic header is relevant to the topic now...

all the best

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Anonymous

Date: Tue Nov 29 7:15 PM, 2005
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-- Edited by QuintriX at 21:54, 2006-01-01

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