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.