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NR 1-3/2005
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Posterior Corneal
Ectasia following LASIK
Ektazja rogówki jako
powikłanie operacji LASIK
Rasik B. Vajpayee (MS, FRCSEd), Rajesh
Sinha (MD, FRCS), Namrata Sharma (MD), Jeewan S. Titiyal (MD),
Radhika Tandon (MD, FRCS, FRCOphth)
Rajendra Prasad Centre for Ophthalmic Sciences
All India Institute of Medical Sciences, New Delhi |
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| Summary: |
Purpose: To
evaluate the cases of posterior corneal ectasia
following laser in situ keratomileusis.
Material and methods: Thirteen eyes of 7 patients,
that were diagnosed to have posterior corneal ectasia
(ł0.060mm) on Orbscan topographic system following LASIK,
were identified. The parameters evaluated were
uncorrected visual acuity (UCVA), best-corrected visual
acuity (BCVA), refraction, contrast sensitivity, glare,
corneal topography, keratometry and pachymetry. The
preoperative and postoperative data at day 1, 1 week, 1
month, 3 months, 6 months and 1year were retrospectively
analyzed.
Results: The mean UCVA of the patients before
LASIK surgery was 0.032 ± 0.04. It was 0.320 ± 0.159 in
follow-up of LASIK surgery after 1 year. The mean
Pre-LASIK BCVA was 0.59 ± 0.11. There was no change in
mean BCVA at 1 year. The mean preoperative spherical
equivalent was -14.25 ± 2.91 D except in 2 hyperopic
eyes in which the mean spherical equivalent
preoperatively was +5.75 ± 0.35 D. The mean
postoperative spherical equivalent after 1 year of LASIK
surgery in last follow-up (± enhancement) was - 3.45 ±
2.08 in the myopic eyes and +1.0 ± 0.70 in the two
hyperopic eyes. The mean preoperative posterior corneal
elevation was 0.022 ± 0.011mm, which at the end of 1
week following LASIK was 0.067 ± 0.009 and at 1 year/
last follow-up following LASIK, it was 0.068 ± 0.006mm.
Conclusions: Higher amplitudes of refractive
correction may lead to the occurrence of posterior
corneal ectasia. |
| Słowa kluczowe: |
tylna rogówkowa ektazja,
keratoektazja, powikłania po operacjach LASIK. |
| Key words: |
posterior corneal ectasia,
keratectasia, LASIK complications. |
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