Colm McAlinden1, Fangjun Bao1, Yan Guo1, Xinxin Yu1, Weicong Lu1, Hao Chen1, Qinmei Wang1, Jinhai Huang2. 1. From the School of Ophthalmology and Optometry (McAlinden, Bao, Guo, Yu, Lu, Chen, Wang, Huang), Wenzhou Medical University, and the Key Laboratory of Vision Science (Bao, Lu, Chen, Wang, Huang), Ministry of Health P.R. China, Wenzhou, Zhejiang, China; the Abertawe Bro Morgannwg University Health Board (McAlinden), Swansea, United Kingdom; Flinders University (McAlinden), Adelaide, South Australia, Australia. 2. From the School of Ophthalmology and Optometry (McAlinden, Bao, Guo, Yu, Lu, Chen, Wang, Huang), Wenzhou Medical University, and the Key Laboratory of Vision Science (Bao, Lu, Chen, Wang, Huang), Ministry of Health P.R. China, Wenzhou, Zhejiang, China; the Abertawe Bro Morgannwg University Health Board (McAlinden), Swansea, United Kingdom; Flinders University (McAlinden), Adelaide, South Australia, Australia. Electronic address: vip999vip@163.com.
Abstract
PURPOSE: To evaluate the agreement between a new optical biometer (AL-Scan) and an anterior-segment Scheimpflug tomographer (Pentacam HR). SETTING:Eye Hospital of Wenzhou Medical University, Zhejiang, China. DESIGN: Prospective randomized comparative case series. METHODS: Three consecutive scans of the right eye of each subject were obtained using each device in a random order. The following common parameters were recorded: central corneal thickness (CCT), anterior chamber depth (ACD), aqueous depth, and keratometry (K) readings (steep, flat, and mean). Bland-Altman limits of agreement (LoA) were calculated for the common device parameters. RESULTS: The study comprised 121 healthy subjects (57 men, 64 women) with a mean age of 25.41 years ± 6.86 (SD) (range 18 to 54 years). The mean difference in CCT was 1.61 μm with LoA of -6.29 to 9.52 μm. The mean difference in the aqueous depth and ACD was 0.02 mm with LoA of -0.10 to 0.14 mm and -0.09 to 0.14 mm, respectively. For the 2.4 mm K readings from the new biometer versus the standard K readings from the Scheimpflug tomographer, the mean difference for flat K, steep K, and mean K was 0.10 diopter (D), 0.05 D, and 0.08 D, respectively. The LoA were -0.17 to 0.38 D, -0.29 to 0.39 D, and -0.19 to 0.34 D, respectively. The CCT, ACD, and all K readings were assessed to be clinically interchangeable. CONCLUSION: There was good agreement between the 2 devices for CCT, ACD, aqueous depth, and K readings. FINANCIAL DISCLOSURE: None of the authors has a financial or proprietary interest in any material or method mentioned.
RCT Entities:
PURPOSE: To evaluate the agreement between a new optical biometer (AL-Scan) and an anterior-segment Scheimpflug tomographer (Pentacam HR). SETTING: Eye Hospital of Wenzhou Medical University, Zhejiang, China. DESIGN: Prospective randomized comparative case series. METHODS: Three consecutive scans of the right eye of each subject were obtained using each device in a random order. The following common parameters were recorded: central corneal thickness (CCT), anterior chamber depth (ACD), aqueous depth, and keratometry (K) readings (steep, flat, and mean). Bland-Altman limits of agreement (LoA) were calculated for the common device parameters. RESULTS: The study comprised 121 healthy subjects (57 men, 64 women) with a mean age of 25.41 years ± 6.86 (SD) (range 18 to 54 years). The mean difference in CCT was 1.61 μm with LoA of -6.29 to 9.52 μm. The mean difference in the aqueous depth and ACD was 0.02 mm with LoA of -0.10 to 0.14 mm and -0.09 to 0.14 mm, respectively. For the 2.4 mm K readings from the new biometer versus the standard K readings from the Scheimpflug tomographer, the mean difference for flat K, steep K, and mean K was 0.10 diopter (D), 0.05 D, and 0.08 D, respectively. The LoA were -0.17 to 0.38 D, -0.29 to 0.39 D, and -0.19 to 0.34 D, respectively. The CCT, ACD, and all K readings were assessed to be clinically interchangeable. CONCLUSION: There was good agreement between the 2 devices for CCT, ACD, aqueous depth, and K readings. FINANCIAL DISCLOSURE: None of the authors has a financial or proprietary interest in any material or method mentioned.
Authors: Teresa Ferrer-Blasco; Alberto Domínguez-Vicent; José J Esteve-Taboada; Miguel A Aloy; Jose E Adsuara; Robert Montés-Micó Journal: Graefes Arch Clin Exp Ophthalmol Date: 2016-11-30 Impact factor: 3.117