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| Comparison of CASIA 2 and IOLMaster 700 for Measuring the Anterior Segment Data |
| Shuyang Wang, Shaochong Bu, Yuanfeng Jiang, Luning Qin, Tingting Wang, Min Zhang, Zong Yu, Song Lin |
| Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin 300384, China |
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Abstract Objective: To evaluate the difference and the consistency of the ocular anterior segment parameters measured with CASIA 2 and IOLMaster 700 in patients with cataract. Methods: In this retrospective study, 95 eyes of 95 patients underwent pre-operative examination for cataract surgery from April 2020 to May 2020 were involved. The central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), keratometry of the steepest meridian (Ks) and keratometry of the flattest meridian (Kf) measured by CASIA 2 and IOLMaster 700 were documented and analyzed using paired t test for differences, earson's test for correlation and Bland-Altman test for consistency. Results: The differences of CCT, ACD and LT values measured by CASIA 2 and IOLMaster 700 were statistically significant (t=-11.94, P<0.001; t=8.52, P<0.001, t=-2.97, P=0.004, respectively), while the differences of Ks and Kf were not statistically significant. The CCT, ACD, LT, Ks and Kf values measured with two instruments were significantly correlated (r=0.99, 0.99, 0.99, 0.98 and 0.97, all P<0.001). Bland-Altman analysis showed that the mean differences of CCT, ACD and LT were -7.516 μm、0.043 mm、0.023 mm, respectively. The limits of agreement (LoA) were -19.92, 4.48 μm, -0.055, 0.139 mm, -0.120, 0.160 mm.The mean differences of Ks and Kf from the two instruments were 0.028 D and 0.061 D, respectively. The 95% LoA were -0.65, 0.77 D and -0.52, 0.578 D. The proportion outside 95% LoA were 7.36%(7/95) and 6.31% (6/95). The values of CCT, ACD, LT, Ks and Kf measured by the two instruments were not consistent.Conclusion: The CCT, ACD, LT, Ks and Kf measured with CASIA 2 and IOLMaster 700 were not consistent.
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Received: 30 March 2022
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Corresponding Authors:
Song Lin, Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin 300384, China (Email: linsong123123@sina.com)
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