Dergiler / Glokom Katarakt / 2019 / Cilt: 14 - Sayı: 4

Axial Eye-Length Measurements Before and After Myopic Laser Refractive Surgery

Miyopik Refraktif Lazer Cerrahisi Öncesinde ve Sonrasında Aksiyel Göz Uzunluğu Ölçümleri

Sayfa
207–211
DOI
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

Since the TAD and ΔCCT values were similar and were correlated with each other, this disparity might have resulted from incorrect AL measurements by the device due to a clinically subtle loss of corneal transparency in patients who had undergone myopic excimer laser surgery.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:Purpose: The purpose of the present study was to evaluate the relationship between axial length (AL) measurements and the theoretical ablation depth (TAD) in eyes that had undergone excimer laser treatment for myopia.
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Temel Bulgular & Veri:Material and methods: We retrospectively reviewed the medical records for 35 eyes of 18 patients who had undergone refractive laser surgery for the treatment of myopia and/or myopic astigmatism.
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Sonuç & Katkı:Since the TAD and ΔCCT values were similar and were correlated with each other, this disparity might have resulted from incorrect AL measurements by the device due to a clinically subtle loss of corneal transparency in patients who had undergone myopic excimer laser surgery.
🔬Tür:Literatür & Derleme Çalışması
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Alan Parametreleri

Özet

Purpose: The purpose of the present study was to evaluate the relationship between axial length (AL) measurements and the theoretical ablation depth (TAD) in eyes that had undergone excimer laser treatment for myopia. Material and methods: We retrospectively reviewed the medical records for 35 eyes of 18 patients who had undergone refractive laser surgery for the treatment of myopia and/or myopic astigmatism. We measured AL, anterior chamber depth (ACD) and central corneal thickness (CCT) using AL-Scan (Nidek CO, Gamagori, Japan). We analyzed the differences between the measurements using a two-tailed paired t test. Results: The mean age of the patients was 26.26±6.43 years, and their mean refractive change (at the corneal plan) was -3.02±1.83 in 21 eyes of 11 patients who had undergone laser in situ keratomileusis and 14 eyes of 7 patients who had undergone photorefractive keratectomy. The AL was signifi cantly shortened after laser surgery, the mean difference in AL [ΔAL] was 56.86±34.45 μm;(P 0.05). On the other hand, ΔAL and TAD ($r^2$ =0.215) and ΔAL and ΔCCT ($r^2$ =0.184) were poorly correlated with each other, but TAD and ΔCCT were strongly correlated ($r^2$ =0.814). Conclusion: The AL-Scan device gave AL values that were inconsistent with the TAD. Since the TAD and ΔCCT values were similar and were correlated with each other, this disparity might have resulted from incorrect AL measurements by the device due to a clinically subtle loss of corneal transparency in patients who had undergone myopic excimer laser surgery.

Abstract

Amaç: Bu çalışmamızın amacı, miyopi nedeniyle refraktif lazer tedavisi uygulanan gözlerde aksiyel uzunluk(AU) ölçümleri ile teorik ablasyon derinliği (TAD) arasındaki ilişkiyi değerlendirmektir. Gereç ve yöntem: Miyopi ve/veya miyop astigmatizma için refraktif lazer cerrahisi geçirmiş 18 hastanın 35 gözüne ait tıbbi kayıtları retrospektif olarak gözden geçirdik. AL-Scan (Nidek CO, Gamagori, Japan) cihazını kullanarak AU, ön kamara derinliği (ÖKD) ve santral kornea kalınlığını (SKK) ölçtük. Ölçümler arası farkları çift yönlü t test kullanarak analiz ettik. Bulgular: Hastaların ortalama yaşı 26.3±6.4 yıl idi, ve ortalama refraktif değişim (kornea düzleminde) −3.02±1.83 D idi. Onbir hastanın 21 gözünde laser in situ keratomileusis (LASİK) ve 7 hastanın 14 gözünde fotorefraktif keratektomi (PRK) uygulandı. Ameliyat sonrası AU değerleri ortalama 56.86±34.45 μm kısaldı ve bu fark istatistiksel olarak anlamlı idi (P 0.05). Bunun yanısıra, ΔAU ile TAD arasında ($r^2$ =0.215) ve ΔAL ile ΔCCT arasında zayıf bir korelasyon bulundu fakat TAD ile ΔSKK güçlü bir şekilde korele idi ($r^2$ =0.814). Sonuç: AL-Scan cihazı, TAD ile uyumlu olmayan AU değerleri verdi. Aradaki bu uyumsuzluk, miyopik excimer lazer cerrahisi geçirmiş hastalarda klinik olarak hafi f derecede korneal saydamlık azalmasından dolayı cihaz tarafından hatalı AU ölçümleri sonucu olabilir.

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Bu Makaleye Atıf Yap

YASSA, E. T., ÜNLÜ, C. (2019). Axial Eye-Length Measurements Before and After Myopic Laser Refractive Surgery. Glokom Katarakt, Cilt: 14 - Sayı: 4, 207–211. https://ajindex.com/articles/161813

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