Original Article
Comparison of CASIA 2 and IOLMaster 700 for Measuring the Anterior Segment Data
Wang Shuyang, Bu Shaochong, Jiang Yuanfeng, Qin Luning, Wang Tingting, Zhang Min, Yu Zong, Lin Song
Published 2022-11-25
Cite as Chin J Optom Ophthalmol Vis Sci, 2022, 24(11): 867-872. DOI: 10.3760/cma.j.cn115909-20220330-00117
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, Pearson'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.
Key words:
anterior segment parameters; CASIA 2; IOLMaster 700; cataract
Contributor Information
Wang Shuyang
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
Bu Shaochong
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
Jiang Yuanfeng
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
Qin Luning
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
Wang Tingting
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
Zhang Min
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
Yu Zong
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
Lin Song
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