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AIM: To compare the central corneal thickness(CCT), keratometry(K)reading, anterior chamber depth(ACD), and axial length(AL)measured with Lenstar and Pentacam with those obtained with the ultrasound(US)pachymetry in the cataract patients.<p>METHODS: A total of 158 eyes of 158 patients were examined in this study. The CCT, average K, ACD and AL obtained by Lenstar and/or Pentacam were compared with those obtained from US pachymetry using repeated-measures analysis of variance, Pearson correlation coefficients and Bland-Altman analyses.<p>RESULTS: The mean CCT obtained using Lenstar and Pentacam were 536.54±27.90μm and 541.46±29.85μm(<i>t</i>=-5.439; <i>P</i><0.001). The mean Km obtained using Lenstar and Pentacam methods were 43.87±1.45D and 43.86±1.44 D(<i>t</i>=-0.348, <i>P</i>>0.05). The mean ACD measured using the Pentacam, Lenstar, and US pachymetry were 2.73±0.38mm, 2.71±0.38mm, and 2.85±0.40 mm, respectively(<i>F</i>=309.94, <i>P</i><0.001), and they were positively correlated(<i>r</i>=0.989, 0.978, and 0.977; <i>P</i><0.001)and the coefficient of variation was small(3.12%). The mean AL obtained by US pachymetry and Lenstar were 24.28±1.70mm and 24.52±1.73 mm, respectively(<i>t</i>=-19.482, <i>P</i><0.001, <i>r</i>=0.996; <i>P</i><0.001). The Bland-Altman analysis showed that the three methods were comparable for CCT, Km, ACD and AL.<p>CONCLUSION: Although there were statistically significant differences, the measurements obtained by the Lenstar and the Pentacam were highly repeatable and the instruments easy to use.