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NR. 2(I)/2005
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Ocena zmian
krzywizny rogówki występujących po zabiegu fotokeratektomii
terapeutycznej (PTK) u pacjentów z nawrotowymi erozjami rogówki
Evaluation of the Corneal Curvature Changes Occurring after
Therapeutic Photokeratectomy (PTK) in Patients with Recurrent
Corneal Epithelial Erosions
Ewa Mrukwa-Kominek, Elżbieta
Magnucka, Stanisława Gierek-Ciaciura, Izabela Zawojska, Rafał
Leszczyński
I Katedra i Klinika Okulistyki Śląskiej Akademii Medycznej w
Katowicach
Kierownik: prof. dr hab. med. Ariadna Gierek-Łapińska |
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| Summary: |
Purpose: The
purpose of the investigation was to evaluate
videokeratography-detected alterations to corneal
curvature, and refractive changes based on spherical
equivalent (EQS). The studied patients underwent
phototherapeutic keratectomy (PTK) in central and
paracentral cornea for recurrent corneal epithelial
erosions.
Patients and methods: Post-PTK corneal curvature
alterations were analysed in 38 patients with recurrent
corneal epithelial erosions. The patients were divided
into two groups depending on the method of surgery
(central PTK – group 1, paracentral PTK – group 2).
Corneal curvature alterations were assessed based on
videokeratographic values K1 and K2 whereas changes in
refraction based on the value of spherical equivalent.
Correlations between keratometric changes, and the
method and depth of photoablation were analysed.
Results: The analysis of K1 and K2 changes
revealed significant differences depending on the method
of photoablation. Mean post-PTK K1 values were
significantly higher than those of K2. Changes in
refraction were observed:
Group 1: mean post-PTK values of spherical equivalent
were higher as compared to those determined prior to PTK;
the difference reached the level of statistical
significance.
Group 2: the difference was not statistically
significant.
Conclusions: Videokeratography allows accurate
visualization of the effect of phototherapeutic
keratectomy.
PTK for recurrent corneal epithelial erosions, performed
according to the method specified in the present paper:
– in central and paracentral erosions – did not seem to
have any effect on corneal curvature and hence also not
on refraction changes;
– central photoablation only resulted in insignificant
corneal curvature alterations, which did not cause
refraction changes. |
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| Key words: |
phototherapeutic
keratektomy, recurrent erosion, keratometry, changes in
refraction. |
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