Comparative analysis of corneal keratometry and astigmatism measurements between IOL Master700 and Pentacam in cataract patients
Objective To investigate the difference and consistency of corneal keratometry and astigmatism measured by IOL Master700 and Pentacam in cataract patients.Methods A total of 115 cataract patients(203 eyes)were select-ed from June 2023 to October 2023.Corneal keratometry and astigmatism of the anterior corneal surface,posterior cor-neal surface and total cornea of cataract patients were measured by IOL Master700 and Pentacam,respectively.Differ-ences,correlations and agreement between the two instruments were analysed.Results Significant differences were found in Ks,Kf and Km of the posterior corneal surface between IOL Master700 and Pentacam(P<0.05),while no significant differences were found in other parameters.Pearson correlation analysis showed a strong correlation between the two instruments in the measurement of Ks,Kf,Km and△k.The correlations for Ks,Kf and Km were more signif-icant than those for △k(P<0.001).Bland-Altman analysis showed strong agreement between the anterior corneal sur-face Ks,Kf and Km measured by the two instruments,but poor agreement between the posterior corneal surface Ks,Kf and Km.Conclusion Firstly,the IOL Master700 and Pentacam show moderate differences and strong consistency in anterior corneal surface keratometry.Secondly,there are minimal differences and significant consistency in the measure-ment of total corneal keratometry.However,significant differences and poor consistency are observed in the posterior corneal surface keratometry.Although the differences in astigmatism measurements for the anterior corneal surface,pos-terior corneal surface and total cornea are minimal between two devices,the consistency is poor.Overall,measurement data from the IOL Master700 and Pentacam should not be used interchangeably in clinical practice,but can be cross-ref-erenced.A comprehensive analysis of the measurement results is recommended for clinical decision making.
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