الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
The aim of our study was to compare the accuracy of the optical biometry (OB) and conventional ultrasound biometry (UB) in determination of the axial length prior to pars plana vitrectomy (PPV), and in silicone oil filled eyes.
In Our study, thirty patients undergoing PPV for retinal detachment were prospectively evaluated. Of the 30 eyes, 16 had PDR (proliferative diabetic ret-inopathy with tractional rhegmatogenous retinal detach¬ment), 12 had recurrent RD with PVR and 2 had endophthalmitis. All patients underwent PPV with silicone oil injection as a primary procedure, followed by pahcoemulsification and silicone oil removal at least 3 months later. Axial length was determined by optical biometry and conventional ultrasound biometry prior to PPV, After PPV (in the presence of silicone oil), and after phacoemulsifaction and silicone oil removal.
Our study results showed that prior to PPV the mean axial length was 23.93±2.31 mm by UB, and 21.83±2.06 mm by OB (mean difference = 2.1±1.62 mm, p < 0.0001). After PPV, and in the presence of silicone oil, the mean axial length was 25.21±2.58 mm by UB, and 24.69±2.42 mm by OB (mean difference = 0.52±0.69 mm, p = 0.0003). After phacoemulsifaction and silicone oil removal, the mean axial length was 24.36±2.41 mm by UB, and 24.51±2.37 mm by OB (mean difference = -0.15±0.30 mm, p = 0.01).
We can conclude that prior to vitrectomy for retinal detachment; axial length determination by B guided A-scan is more accurate, as a presence of retinal detachment causes underestimation of axial length by optical means. In the presence of silicone oil, both types of biometry yield comparable measurements.