Turkiye Klinikleri Journal of Ophthalmology

.: ORIGINAL RESEARCH
Repeatability of Anterior Chamber Dimension Measurements Performed by a Scheimpflug-Placido Analyser in Unoperated and Post-Refractive Surgery Eyes
Ameliyat Edilmemiş ve Refraktif Cerrahi Geçirmiş Gözlerde Scheimpflug-Placido Analyzer Tarafından Yapılan Ön Kamara Boyut Ölçümlerinin Tekrarlanabilirliği
Ertuğrul Tan YASSAa, Cihan ÜNLÜa, Tugba KURTa
aFEBO Asya Eye Medical Center, Department of Ophthalmology, İstanbul, TURKEY
Turkiye Klinikleri J Ophthalmol. 2020;29(2):150-7
doi: 10.5336/ophthal.2019-71150
Article Language: EN
Full Text
ABSTRACT
 Objective: We aimed to evaluate the repeatability of iridocorneal angle (IA), anterior chamber depth (ACD), and anterior chamber volume (ACV) measurements of the rotating Scheimpflug camera combined with a Placido disc anterior segment analyser in unoperated and post-refractive surgery eyes. Material and Methods: In this prospective study, we measured IA, ACD, and ACV using a Sirius (CSO, Florence, Italy). Glaucoma summary mode of the Sirius provides nasal and temporal IA values at different angles (specifically; 0°, +10°, +20°, +30°, -10°,-20°, and-30° degrees) automatically and an average value as IA. We calculated repeated measures one-way analysis of variance (ANOVA), intraclass correlation coefficient (ICC), withinsubject standard deviation (Sw), intrasession test-retest variability, and coefficient of variation (COV) to determine repeatability. Results: This study included 50 eyes of 50 subjects without a history of refractive surgery with a mean age of 42.6 years and 13 eyes of 13 subjects who had undergone LASIK or PRK with a mean age of 39.1 years. We did not find any statistically significant differences between consecutive measurements using repeated measures ANOVA in both groups. For the average IA, ACD, and ACV measurements, repeatability was excellent with ICC > 0.90 in both groups. For the IA measurements at different meridians, the ICC value was below 0.9 at all nasal meridians with the exception of nasal angle 10o in operated eyes and higher than 0.8 for all temporal meridians. Conclusion: Iridocorneal angle measurements of the Sirius device at temporal meridians showed moderate or high repeatability, whereas at nasal meridians, it showed poor or moderate repeatability in both normal and post-refractive surgery eyes. On the other hand, ACD and ACV measurements of the Sirius showed excellent repeatability in both groups.

Keywords: Corneal topography; refractive surgical procedures; anterior chamber
ÖZET
 Amaç: Bu çalışmada, ameliyat edilmemiş ve refraktif cerrahi geçirmiş gözlerde Placido disk ile bağlantılı rotasyonel Scheimpflug kamera içeren bir ön segment analiz cihazı ile elde edilen iri-dokorneal açı (İA), ön kamara derinliği (ÖKD) ve ön kamara hacmi (ÖKH) ölçümlerinin tekrarlanabilirliğini değerlendirmeyi amaçladık. Gereç ve Yöntemler: Bu prospektif çalışmada, Sirius (CSO, Floransa, İtalya) cihazı kullanarak İA, ÖKD ve ÖKH'yi ölçtük. Sirius'un glokom özet modu, farklı açılarda (spesifik olarak 0°, +10°, +20°, +30°, −10°,−20°, and -30° dereceleri) nazal ve temporal İA değerlerini otomatik olarak ölçer ve ilaveten bir ortalama İA değeri sunar. İA, ÖKD ve ÖKH ölçümleri tekrarlanabilirliği, tek yönlü varyans analizi (ANOVA), gözlem içi korelasyon katsayısı (İKK), bireye özgü standart sapma (Sw), sınıf içi test-tekrar test değişkenliği ve varyasyon katsayısı (VK) hesaplanarak değerlendirildi. Bulgular: Bu çalışmada, ortalama yaşı 42,6 olan ve refraktif cerrahi öyküsü olmayan 50 hastanın 50 gözü ve yaş ortalaması 39,1 yıl olan LASIK veya PRK tedavisi geçirmiş 13 hastanın 13 gözü yer aldı. Her iki grupta ardışık ölçümler, tekrarlanan ölçümler ANOVA testi kullanılarak değerlendirildi ve istatistiksel olarak anlamlı bir fark bulunamadı. Ortalama İA, ÖKD ve ÖKH ölçümleri için her iki grupta da tekrarlanabilirlik mükemmeldi (İKK>0,90 idi). Farklı meridyenlerdeki İA ölçümleri için, İKK değerleri, ameliyat edilen gözlerde nazal 10o değeri hariç tüm nazal meridyenler için 0,9'un altında ve tüm temporal meridyenler için 0,8'in üstünde idi. Sonuç: Sirius cihazının iridokorneal açı ölçümleri, temporal meridyenlerde orta veya yüksek tekrarlanabilirlik gösterirken, nazal meridyenlerde hem normal hem de refraktif cerrahi geçirmiş gözlerde zayıf veya orta derecede tekrarlanabilirlik göstermiştir. Diğer yandan, Sirius'un ÖKD ve ÖKH ölçümleri her iki grupta da mükemmel tekrarlanabilirlik göstermiştir.

Anahtar Kelimeler: Kornea topografisi; refraktif cerrahi işlemler; ön kamara
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