Category: Background
Chestnuts roasting...
...on an open fire. That's what we all miss nowadays. Well, apart from Flo and Jan who are the two people I know who've already got stoves at home. But apart from them, the rest of us miss open fires. Well, I've found the answer, and it's here. The iYule fireplace:
I couldn't resist buying it. For only £5 you get a range of DRM-free videos. They've got versions for iPods as well as up to TV resolution, with or without cheesy music! And because it's DRM-free, you can give it as a gift. Sweeeet! Buy one yourself for Christmas.
Tales From Topographic Oceans
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:
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:
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...
Eye results
Forgot to post this a couple of weeks back. I had my four-month post-op check on my eyes. Nick Dash at Accuvision said that they've healed great. My prescription now is around 0.25D - so just slightly off perfect - and on the Snellen chart I could read the 20:20 line. My eyes have been slightly dry lately which has meant that I can't quite manage the next line down.
Anyway, I'm reminded about all this because Nick sent me the topographies - before and after - since someone in the office expressed an interest in seeing how my eyes changed. I've scanned the images and I'll attach them later.
01/08/08 12:17:13 pm, 



