Potec PRK-6000 Otorefraktometre, IOLMaster ve Pentacam ile Ölçülen Keratometri Değerlerinin Tekrarlanabilirliği ve Karşılaştırılması

Abstract

Amaç: Potec PRK-6000 otorefraktometre, IOLMaster ve Pentacam ile ölçülen keratometri değerlerinin tekrarlanabilirliğini ve birbirleriyle olan uyumluluklarını araştırmak. Gereç ve Yöntem: Bu prospektif çalışmada refraksiyon kusuru dışında ek bir oküler patolojisi bulunmayan 55 olgunun 110 gözünde, iki farklı oturumda olmak üzere, bahsedilen üç cihaz ile ardışık ölçümler yapıldı. Her iki oturumda elde edilen düz ve dik keratometri, ortalama keratometri ile korneal astigmatizma değerlerinin tutarlılığı gözlem içi korelasyon katsayısı (ICC) kullanılarak kıyas edildi. Cihazlar arası ölçüm farklılıkları da istatistiksel olarak ayrıca karşılaştırıldı. Materials and Methods:In this prospective study, consecutive measurements were performed in two different sessions with the mentioned three devices on 110 eyes of 55 subjects who had no additional ocular pathology except for refraction error. The consistency of flat and steep keratometry, average keratometry, and corneal astigmatism values obtained in both sessions was compared by using intraclass correlation coefficient (ICC). The measurement differences between the devices were statistically compared as well. Results: The mean age of the study subjects was 23.05±3.01 (18-30) years. ICC values of average keratometry measurements obtained in the sessions were 0.996 for Potec PRK-6000 autorefractometer, 0.997 for IOL Master, and 0.999 for Pentacam. There was high compatibility between the three devices in terms of average keratometry values in Bland-Altman analysis. However, there were statistically significant differences between the devices in terms of parameters other than corneal astigmatism. Conclusion: The repeatability of the three devices was found considerably high in keratometry measurements. However, it is not appropriate for these devices to be substituted for each other in keratometry measurements. (Turk J Ophthalmol 2014; 44: 179-83)

Comparison of Anterior Segment Measurements Obtained by Aladdin Optical Biometer and Sirius Corneal Topography

“…Although we did not encounter any studies in the literature comparing keratometric analyses of the two devices used in our study, there are various reports using and comparing many different devices and methods in keratometric analysis. 25,26,27 Some of those studies reported that using certain devices as substitutes for one another may not be suitable due to significant differences in keratometric measurements. 26,27 As an explanation, the authors suggested that using different methods to measure keratometry may yield different results.…”

Agreement between swept-source optical biometry and Scheimpflug-based topography measurements of posterior corneal curvature

“…1,2 Current devices for measuring posterior corneal analysis use scanning-slit corneal topography (Orbscan; Bausch & Lomb, Inc.), color light-emitting diode topography (Cassini system; i-Optics Corp.; Ophtec), swept-source optical coherence tomography (SS-OCT), and Scheimpflug imaging. [3][4][5][6][7][8][9][10] IOLMaster 700, Anterion (Heidelberg Engineering GmbH), and Eyestar 900 (Haag-Streit AG) devices are based on SS-OCT technology. The Scheimpflug imaging technique is available in many devices such as the Pentacam HR, the Sirius (Costruzione Strumenti Oftalmici), the TMS-5 (Tomey Corp.), and the Galilei (Ziemer Ophthalmic Systems AG).…”