Comparison of Anterior Segment Measurements with a New Multifunctional Unit and Five Other Devices
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Purpose: To evaluate the clinical availability of a multifunctional ocular biometric unit, MR-6000, for simultaneous keratometry,tonometry, topography, and pachymetry evaluation, and compare anterior segment measurements with five otherdevices: autokeratometer (KR-1), Scheimpflug camera (Pentacam HR), swept-source optical coherence tomography (IOLMaster700), Placido disk scanning-slit topography (Orbscan II), and noncontact tonometry (FT-1000). Methods: Thirty eyes from thirty patients who visited Severance Hospital for cataract surgery were examined using MR-6000 and the other devices. The mean keratometry, central corneal thickness (CCT), white-to-white (WTW) distance, and intraocularpressure (IOP) values were compared. Repeated measures analysis of variance, Wilcoxon signed-rank test, intraclasscorrelation coefficient (ICC), and Bland-Altman plot were used to assess the correlation and agreement between devices. Results: Thirty eyes of thirty patients were evaluated. Statistically significant differences in mean keratometry between MR-6000, KR-1, Pentacam HR, and IOLMaster 700 were not observed (p > 0.05). All five devices, including Orbscan II, had almostperfect agreement in measuring keratometry (ICC > 0.80, p < 0.05). CCT measured by MR-6000 was significantly differentfrom that of Pentacam HR and Orbscan II measurements (p < 0.05) but correlated with that of Pentacam HR and OrbscanII measurements (ICC > 0.60, p < 0.05). The WTW distance measured by MR-6000 was not significantly different from thatmeasured by IOLMaster 700 but was different from that measured by Orbscan II. IOP measured by MR-6000 was not correlatedwith FT-1000. Conclusions: Keratometric values obtained through MR-6000 can be used interchangeably with other devices based on goodcorrelation and agreement. However, the CCT, WTW, and IOP values were not interchangeable with a single multifunctionalunit for cataract surgery preoperative examination.
Abstract
Purpose: To evaluate the clinical availability of a multifunctional ocular biometric unit, MR-6000, for simultaneous keratometry,tonometry, topography, and pachymetry evaluation, and compare anterior segment measurements with five otherdevices: autokeratometer (KR-1), Scheimpflug camera (Pentacam HR), swept-source optical coherence tomography (IOLMaster700), Placido disk scanning-slit topography (Orbscan II), and noncontact tonometry (FT-1000). Methods: Thirty eyes from thirty patients who visited Severance Hospital for cataract surgery were examined using MR-6000 and the other devices. The mean keratometry, central corneal thickness (CCT), white-to-white (WTW) distance, and intraocularpressure (IOP) values were compared. Repeated measures analysis of variance, Wilcoxon signed-rank test, intraclasscorrelation coefficient (ICC), and Bland-Altman plot were used to assess the correlation and agreement between devices. Results: Thirty eyes of thirty patients were evaluated. Statistically significant differences in mean keratometry between MR-6000, KR-1, Pentacam HR, and IOLMaster 700 were not observed (p > 0.05). All five devices, including Orbscan II, had almostperfect agreement in measuring keratometry (ICC > 0.80, p < 0.05). CCT measured by MR-6000 was significantly differentfrom that of Pentacam HR and Orbscan II measurements (p < 0.05) but correlated with that of Pentacam HR and OrbscanII measurements (ICC > 0.60, p < 0.05). The WTW distance measured by MR-6000 was not significantly different from thatmeasured by IOLMaster 700 but was different from that measured by Orbscan II. IOP measured by MR-6000 was not correlatedwith FT-1000. Conclusions: Keratometric values obtained through MR-6000 can be used interchangeably with other devices based on goodcorrelation and agreement. However, the CCT, WTW, and IOP values were not interchangeable with a single multifunctionalunit for cataract surgery preoperative examination.
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