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-   -   Corneal topography (https://www.pprune.org/medical-health/619726-corneal-topography.html)

Dr Jekyll 22nd Mar 2019 20:56

Corneal topography
 
I know that if you apply for a class 1 medical and your astigmatism exceeds 2 dioptres you have to go for a corneal topography examination. What exactly are they looking for on this and is there any way to judge in advance what your chances of passing may be?

nonsense 23rd Mar 2019 05:48

Presumably they are looking for kerataconus, where the surface of the cornea is uneven or bulged.
Curiously I have about 3 dioptres of cyl (astigmatism) in one eye (due to cataract surgery 28 years ago), and kerataconus, -4 dioptres of myopia, but almost no cyl at all in my other eye.

Blues&twos 26th Mar 2019 08:15

Keratoconus is a progressive condition, so presumably the topography requirement is to ensure it isn't kc or anything else which may slowly worsen vision. The vision can reduce slowly enough that the patient won't necessarily notice straight away.

nonsense 26th Mar 2019 14:33


Originally Posted by Blues&twos (Post 10430041)
Keratoconus is a progressive condition, so presumably the topography requirement is to ensure it isn't kc or anything else which may slowly worsen vision. The vision can reduce slowly enough that the patient won't necessarily notice straight away.

Mine doesn't seem to have progressed in 30 years; I'm seeing my optom this week, I'll ask...

Blues&twos 26th Mar 2019 14:46


Originally Posted by nonsense (Post 10430403)
Mine doesn't seem to have progressed in 30 years; I'm seeing my optom this week, I'll ask...

Hi, mine progressed quite quickly after diagnosis as a child, requiribg surgery.
it seems the condition varies quite a lot between individuals:

The course of the disorder can be quite variable, with some patients remaining stable for years or indefinitely, while others progress rapidly or experience occasional exacerbations over a long and otherwise steady course. Most commonly, keratoconus progresses for a period of 10 to 20 years before the course of the disease generally ceases in the third and fourth decades of life.
​​​​​​

Dr Jekyll 26th Mar 2019 19:27

That's interesting, thanks. So if they have no Keratocunus it should be OK.

Blues&twos 26th Mar 2019 22:05

I don't know what else they may be looking for, Dr. Jekyll. Keratoconus is just a corneal condition with which I'm familiar - unfortunately.
Good luck with the medical!

TomahawkEI 6th Apr 2019 22:31

I think you can tell a lot more than Keratoconus. Can’t you tell the amount of astigmatism and refraction using this too, compared to an autofractor?


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