Comparison of Keratometric Values Using Javal Keratometer, Oculus Pentacam, and Orbscan II

Purpose: To compare Orbscan II and Pentacam keratometry readings in terms of their agreement with a manual Javal type keratometer Methods: In this retrospective study, records of patients who had refractive surgery were reviewed. We extracted data of 765 eyes which had keratometry with the Javal keratometer; of these, 577 had Orbscan II and 200 eyes had Pentacam acquisitions. Minimum (min-K) and maximum (max-K) keratometry readings and keratometric astigmatism with the latter two devices were compared with Javal. Results: Correlation coefficients for Javal and Orbscan II in measuring min-K and max-K were r=0.916 and r=0.913, respectively (p<0.001). The 95% limits of agreement (LoA) between Javal and Orbscan II was 1.17-1.20 D for min-K and 1.22-1.24 D for max-K. The coefficients for Pentacam and Javal min-K and max-K readings were very high (r=0.943 and r=0.962). The 95% LoA between Pentacam and Javal in measuring min-K and max-K were 0.51-0.99D and 0.72- 0.99D, respectively. The correlation between Pentacam and Javal measurements of keratometric astigmatism was stronger than that for Orbscan II and Javal (r=0.973 and r=0.800); the 95% LoA was 0.55-0.76D for Pentacam and Javal, and 1.14-1.19D for Orbscan II and Javal. Conclusion: According to this research, Orbscan II and Pentacam had high correlation and agreement with Javal-keratometer in determining keratometric values. Nevertheless, the results obtained from Pentacam showed better agreement and stronger correlation with Javal as compared with Orbscan II. It seems that Pentacam is a suitable substitute for Javal to perform keratometry in normal eyes.