Comparison of central corneal thickness measurements in normal and keratoconic eyes using ultrasonic pachymetry and OCULUS pentacam [Normal ve keratokonuslu gölerde ultrasonik pakimetri ve OCULUS pentacam ile ölçülen santral kornea kalınlıklarının karşılaştırılması]

Purpose: To compare the central corneal thickness (CCT) measurements in normal and keratoconic eyes using ultrasonic pachymetry (Ocuscan® RxP) and OCULUS Pentacam Scheimpflug camera. Material and Method: In this prospective study, CCT measurements were done in 57 keratoconic eyes and 62 healthy eyes by OCULUS Pentacam and ultrasonic pachymetry, consecutively. The measurements taken by the 2 instruments were compared with paired-samples t-test. A p value <0.05 was considered as statistically significant. The correlation between the measurements was evaluated using the Pearson test. Results: The mean CCT of keratoconic eyes was 480.18±33.6 ±m with Pentacam and 465.67±34.5 ±m with ultrasonic pachymetry, which demonstrates a statistically significant difference (t=-5.87; p585 ±m (t=-3.3; p=0.005). There was a high correlation between the CCT readings done by the two methods (r=0.95, p<0.001). Discussion: The CCT measurements obtained by Pentacam in both keratoconic and healthy eyes highly correlated with the ultrasonic measurements. However, the CCT measurements taken by Pentacam were higher compared to the ultrasonic measurements; therefore, one and the same imaging technique should be used in follow-up measurements.