The Deterministic Values of Angle Parameters Measured by Ultrasound Biomicroscopy in Patients with Open Angle After Cataract Surgery

Abstract

A AB BS ST TR RA AC CT T O Ob bj je ec ct ti iv ve e: : To investigate the deterministic values of angle recess area (ARA), angle opening distances at the locations 250 µm (AOD 250 ) and 500 µm (AOD 500 ) anterior to the scleral spur and trabecular-iris angle (TIA) in patients with open angle undergoing cataract surgery. M Ma at te er ri ia al l a an nd d M Me et th ho od ds s: : Thirty-three eyes of 33 patients with open angle undergoing cataract surgery were enrolled in this study. Ultrasound biomicroscopy (UBM) examination was performed preoperatively and 1 month postoperatively under a standard protocol. At each examination, radial sections of the angle at four quadrants were obtained. The images were analyzed using UBM Pro 2000 software for AOD and ARA semiautomatically, and for TIA manually. R Re es su ul lt ts s: : The postoperative increases in the ARA, TIA, AOD 250 and AOD 500 were statistically significant at four quadrants (p<0.0001). The average increase in the ARA was 0.064±0.037 mm² (44%), in the AOD 250 was 0.056±0.02 mm (70%), in the AOD 500 was 0.074±0.03 mm (56%) and in the TIA was 12.3±4.8º (52%). We determined statistically significant correlations between changes in the ARA with AOD 250 (r=0.54, p=0.001) and AOD 500 (r=0.74, p=0.0001). The lowest extraction value was AOD 250 and the highest extraction value was AOD 500 in three quadrants. Differently, the highest extraction value was determined as ARA at the nasal quadrant. C Co on nc cl lu us si io on n: : Our study showed that AOD 500 is as valuable as ARA in patients with open angle in the quantitative evaluation of the angle. This may not be the case in closed or occludable angles. AOD can be used reliably for the evaluation of the angle by the observers having UBM models without image analysis software.K Ke ey y W Wo or rd ds s: : Ultrasonography; anterior eye segment Ö ÖZ ZE ET T A Am ma aç ç: : Katarakt cerrahisi uygulanacak açık açılı hastalarda, açı açıklık alanı (AAA), skleral mahmuzun 250 µm (AAM 250 ) ve 500 µm (AAM 500 ) önündeki lokalizasyonlarda açı açılım mesafesi (AAM), ve trabekülum-iris açısının (TİA) belirleyicilik değerlerini araştırmak. G Ge er re eç ç v ve e Y Yö ön nt te em ml le er r: : Bu çalışmada katarakt ameliyatı olacak açık açılı 33 hastanın 33 gözü çalışmaya dahil edilmiştir. Ameliyat öncesinde ve ameliyattan 1 ay sonra standart bir protokol halinde ultrason biyomikroskopisi (UBM) yapılmıştır. Her muayenede, 4 kadranda açının radial kesitleri elde edilmiştir. Görüntülerde AAM ve AAA, UBM Pro2000 yazılımı ile yarı-otomatik olarak, TİA ise manüel olarak analiz edilmişlerdir. B Bu ul lg gu ul la ar r: : AAA, TİA, AAM 250 ve AAM 500 değerlerindeki ameliyat sonrası artışlar 4 kadranda istatistiksel olarak anlamlıdır. (p<0,0001). AAA'da ortalama artış miktarı 0,064±0,037 mm² (%44), AAM 250 'de 0,056±0,02 mm (%70), AAM 500 'de 0,074±0,03 mm (%56) ve TİA'da 12,3±4,8º (%52)'dir. AAA ile AAM 250 (r=0,54, p=0,001) ve AAM 500 'deki değişiklikler (r=0,74, p=0,0001) arasında istatistiksel olarak önemli korelasyonlar sap...