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Home > Archive > Lasik Eyes Surgery > April 2005 > LASIK - Normal Nerve Innervation of Cornea May Never Return
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LASIK - Normal Nerve Innervation of Cornea May Never Return
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| gospa68@aol.com 2005-04-26, 5:53 pm |
| Br J Ophthalmol. 2005 May;89(5):580-5.
Corneal sensation after myopic and hyperopic LASIK: clinical and
confocal microscopic study.
Bragheeth MA, Dua HS.
Division of Ophthalmology and Visual Sciences, B floor, Eye Ear Nose
Throat Centre, university Hospital, Queens Medical Centre, Nottingham
NG7 2UH, UK. harminder.dua@nottingham.ac.uk.
AIM: To assess the long term (1 year) effect of myopic and hyperopic
LASIK on corneal sensation and innervation. METHODS: 83 eyes of 43
patients having LASIK were evaluated. According to the preoperative
spherical equivalent, the eyes were divided into three groups: group 1,
myopia from -0.75 to -6.00 D; group 2, myopia from -6.25 to -11.50 D;
and group 3, hyperopia from 1.25 to 5.00 D. Corneal sensation was
measured and in vivo confocal microscopy (IVCM) was done at the central
cornea before, and at 1 month, 3 months, 6 months, and 1 year after
LASIK. RESULTS: The mean corneal sensation in group 1 was greater than
in groups 2 and 3 at all postoperative measurements. The difference
between group 1 on one hand and groups 2 and 3 on the other hand was
statistically significant at 1 month and 3 months after LASIK and was
not statistically significant afterwards. IVCM study of 27 eyes
revealed that the number and length of nerve fibre bundles in the
sub-basal region decreased after LASIK and was significantly lower at
all times after surgery despite the return of corneal sensation to
preoperative level. CONCLUSION: After LASIK, central corneal
sensitivity is decreased for as long as 6 months or more. The results
suggest that lamellar cutting of the cornea during LASIK impairs
corneal sensitivity and is related to the ablation depth. The diameter
of ablation too may contribute to this drop in sensitivity. The return
of corneal sensations does not directly correlate with the regeneration
of nerve fibres as determined by confocal imaging. Sensations return to
normal values before complete restoration of normal innervation IF THIS
INDEED EVER OCCURS.
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| In article <1114544940.885399.295870@z14g2000cwz.googlegroups.com>,
gospa68@aol.com wrote:
> Sensations return to
> normal values before complete restoration of normal innervation IF THIS
> INDEED EVER OCCURS.
In other words, sensation returns to normal in the eye before the nerves
completely regenerate. That's good to know, so that even if nerves are
severed, sensation is not permanently disrupted. The body is really
amazing, isn't?
--
~RT
The truth lies somewhere between Ragnar and LASIKtruth
Two sides of the same coin
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| Ragnar 2005-04-26, 10:59 pm |
| One thing to consider is just what those nerves are doing anyway..
such as triggering the automatic blinking reflex. Certainly less
blinking would result in some dryness.
One can get in the habit of blinking more.
On Wed, 27 Apr 2005 00:38:59 GMT, RT <RTMD24@NOSPAMyahoo.com> wrote:
>In article <1114544940.885399.295870@z14g2000cwz.googlegroups.com>,
> gospa68@aol.com wrote:
>
>
>In other words, sensation returns to normal in the eye before the nerves
>completely regenerate. That's good to know, so that even if nerves are
>severed, sensation is not permanently disrupted. The body is really
>amazing, isn't?
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