Tales From Topographic Oceans

by dr-nick Email

Yes!

Sorry, pun there.

As promised, here are the topographic images from my pre- and post-op measurements, with clickable big versions. In true opthalmologist stylee, I'll do 'em in RL order. First up; the post-op:

Right eyeLeft eye

If you look at the tangential maps (bottom right of each scan) you'll see the detail in the centre of the eyes around the pupil. The left eye is quite even, whilst the right eye has a bit more variation. This is consistent with how they feel - the right eye has felt a bit more fuzzy.

Now the differences:

Right eyeLeft eye

Perhaps the easiest thing to see is in this bottom pair of scans. For each eye, you get three false-colour pictures. These are your basic axial map corneal topographs :)

  • Before (left) and after (right)
  • Difference between them (centered below)

On the left, you can see quite a lot of green, whereas on the right, you see blue 'rings'. The change is where the laser has whittled away some of the cornea (top layer of eye) to make it flatter in the middle and steeper at the edges. The end result is that the cornea is a bit weaker at magnifying which gets rid of the short-sightedness. If you compare the figures under the 'Keratometer' headings, you'll see that the power of the cornea has gone from around 43-44D to 39D. That's a reduction of around 4-5D, which (coincidentally :) ) was my prescription before the LASIK surgery.

You can read more about what all this stuff means elsewhere. Interesting stuff. Well, I thought so...

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