Cınar Yasin, Cingü Abdullah Kürşat, Sahin Muhammed, Sahin Alparslan, Yüksel Harun, Türkcü Fatih Mehmet, Cınar Tuba, Caça Ihsan
Department of Ophthalmology, Faculty of Medicine, Dicle University, 21280 Diyarbakır, Turkey.
J Ophthalmol. 2013;2013:481238. doi: 10.1155/2013/481238. Epub 2013 Aug 5.
Purpose. To compare the measurements of optical versus ultrasonic biometry devices in keratoconic eyes. Materials and Methods. Forty-two eyes of 42 keratoconus (KC) patients enrolled in the study were examined. Clinical and demographic characteristics of the patients were noted, and detailed ophthalmological examination was performed. Following Pentacam measurements, central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), and axial length (AL) were obtained using the Lenstar and US biometer to determine the reproducibility of the measurements between the two devices in keratoconic eyes. The Bland-Altman method was used to describe the agreement between the two devices. Results. The Lenstar could not measure at least one of the biometric properties in one eye and did not automatically give the corrected ACD in 2/3 of our study population. The Lenstar measured CCT (average difference 5.4 ± 19.6 µm; ICC = 0.90; P < 0.001), LT (average difference 0.13 ± 0.17 mm; ICC = 0.67; P < 0.001), and AL (average difference 0.10 ± 0.76 mm; ICC = 0.75; P < 0.001) thinner than US biometer, whereas it measured ACD (average difference 0.18 ± 0.17 mm; ICC = 0.85; P < 0.001) deeper than US biometer in keratoconic eyes. Conclusion. Although the difference between the measurements obtained using the two devices might be clinically acceptable, US biometry and Lenstar should not be used interchangeably for biometric measurements in KC patients.
目的。比较圆锥角膜眼的光学与超声生物测量设备的测量结果。材料与方法。对纳入研究的42例圆锥角膜（KC）患者的42只眼进行检查。记录患者的临床和人口统计学特征，并进行详细的眼科检查。在进行Pentacam测量后，使用Lenstar和超声生物测量仪获取中央角膜厚度（CCT）、前房深度（ACD）、晶状体厚度（LT）和眼轴长度（AL），以确定这两种设备在圆锥角膜眼中测量结果的可重复性。采用Bland-Altman方法描述两种设备之间的一致性。结果。Lenstar无法测量一只眼中的至少一项生物测量属性，并且在我们研究人群的2/3中不能自动给出校正后的ACD。Lenstar测量的CCT（平均差异5.4±19.6μm；ICC = 0.90；P < 0.001）、LT（平均差异0.13±0.17mm；ICC = 0.67；P < 0.001）和AL（平均差异0.10±0.76mm；ICC = 0.75；P < 0.001）比超声生物测量仪测量的值更薄，而在圆锥角膜眼中测量的ACD（平均差异0.18±0.17mm；ICC = 0.85；P < 0.001）比超声生物测量仪测量的值更深。结论。尽管使用这两种设备获得的测量结果之间的差异在临床上可能是可接受的，但在KC患者的生物测量中，超声生物测量和Lenstar不应互换使用。
