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Post Info TOPIC: Depressed KC
GRS


Optometrist

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Posts: 31
Date: Fri Aug 26 6:10 AM, 2016
RE: Depressed KC
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JimKC wrote:

I'd be interested in joining a conversation on the optics of keratoconus if you want to start one Dr. G.


 Well, great!  Let's get started.  I will try to prepare some discussion points, or else if you can suggest something we can go from there.



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GRS


Optometrist

Status: Offline
Posts: 31
Date: Sat Aug 27 3:41 PM, 2016
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JimKC wrote:

I'd be interested in joining a conversation on the optics of keratoconus if you want to start one Dr. G.


I thought I might start with this link to a blog post of mine.  I took OCT scans of a keratoconus eye and created a digital mold in a 3D CAD system.  That's the first set of images.  Then I took the central part of the KC cornea and created a best fit sphere so it would highlight the irregularities of the KC cornea, i.e. how it deviated from a perfect shape, hence perfect optics.

I then did a ray tracing on the sphere to show how all light rays met at the same place.  I then did a ray trace of the KC cornea to show how the rays DID NOT meet at the same point in the eye to create a very large blur.

Then I superimposed an idealized scleral lens shape on the KC eye to show why the lens does not lead to perfect vision and causes a distortion called COMA.

https://laserfitlens.com/wavefront-lens-process-simplified/

 



-- Edited by GRS on Sunday 28th of August 2016 02:30:29 PM

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Deb


Veteran Member

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Posts: 96
Date: Tue Aug 30 7:46 AM, 2016
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Hey hey...good topic...it might need a new thread...however I was talking with someone who was given "pin hole (soft) contact lenses"...ok the vision to the side is limited like a house who wears blinkers...but vision was reported as being excellent...I suggested trying this type of contact lens with the worst eye only...so the other eye an compensate for it.



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GRS


Optometrist

Status: Offline
Posts: 31
Date: Tue Aug 30 6:32 PM, 2016
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Deb wrote:

Hey hey...good topic...it might need a new thread...however I was talking with someone who was given "pin hole (soft) contact lenses"...ok the vision to the side is limited like a house who wears blinkers...but vision was reported as being excellent...I suggested trying this type of contact lens with the worst eye only...so the other eye an compensate for it.


 Oh, how brilliant!  I wonder why I've never seen one of those actually on a patient?  Seems like such an elegant, inexpensive, and common-sense solution.   I did try that some years ago without much success.



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www.laserfitlens.com

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