PURPOSE: The aim of this study was to evaluate the repeatability and reproducibility of foveal avascular zone (FAZ) area measurements using AngioPlex spectral domain optical coherence tomography (OCT) angiography in normal subjects. METHODS: Twenty-two healthy subjects (25 eyes) underwent FAZ area measurements with AngioPlex OCT. Each volunteer was separately examined 3 consecutive times by the 2 experienced observers. The FAZ area was measured using ImageJ software. Intraobserver repeatability was evaluated by calculating the coefficient of variation (CoV) and intraclass correlation coefficient (ICC). Interobserver reproducibility was also assessed using the Bland-Altman test and concordance correlation coefficient (CCC). RESULTS: The FAZ areas were measured as 0.373 ± 0.109 and 0.377 ± 0.112 mm2 by observers 1 and 2, respectively. The repeatability assessment of the FAZ area measurements yielded CoV values of 0.029 and 0.034 and ICC values of 0.997 and 0.996 by observers 1 and 2, respectively. The mean difference between the 2 observers was 0.004. CCC values ranged from 0.9705 to 0.9844. CONCLUSIONS: The FAZ area measurements obtained using AngioPlex OCT showed a good repeatability and reproducibility in healthy subjects. Excellent reliability makes AngioPlex OCT a valid device for measuring the FAZ area.
PURPOSE: The aim of this study was to evaluate the repeatability and reproducibility of foveal avascular zone (FAZ) area measurements using AngioPlex spectral domain optical coherence tomography (OCT) angiography in normal subjects. METHODS: Twenty-two healthy subjects (25 eyes) underwent FAZ area measurements with AngioPlex OCT. Each volunteer was separately examined 3 consecutive times by the 2 experienced observers. The FAZ area was measured using ImageJ software. Intraobserver repeatability was evaluated by calculating the coefficient of variation (CoV) and intraclass correlation coefficient (ICC). Interobserver reproducibility was also assessed using the Bland-Altman test and concordance correlation coefficient (CCC). RESULTS: The FAZ areas were measured as 0.373 ± 0.109 and 0.377 ± 0.112 mm2 by observers 1 and 2, respectively. The repeatability assessment of the FAZ area measurements yielded CoV values of 0.029 and 0.034 and ICC values of 0.997 and 0.996 by observers 1 and 2, respectively. The mean difference between the 2 observers was 0.004. CCC values ranged from 0.9705 to 0.9844. CONCLUSIONS: The FAZ area measurements obtained using AngioPlex OCT showed a good repeatability and reproducibility in healthy subjects. Excellent reliability makes AngioPlex OCT a valid device for measuring the FAZ area.
Authors: S Tammy Hsu; Hoan T Ngo; Sandra S Stinnett; Nathan L Cheung; Robert J House; Michael P Kelly; Xi Chen; Laura B Enyedi; S Grace Prakalapakorn; Miguel A Materin; Mays A El-Dairi; Glenn J Jaffe; Sharon F Freedman; Cynthia A Toth; Lejla Vajzovic Journal: Ophthalmology Date: 2019-07-15 Impact factor: 12.079
Authors: Peter M Maloca; Richard F Spaide; Emanuel Ramos de Carvalho; Harald P Studer; Pascal W Hasler; Hendrik P N Scholl; Tjebo F C Heeren; Julia Schottenhamml; Konstantinos Balaskas; Adnan Tufail; Catherine Egan Journal: Graefes Arch Clin Exp Ophthalmol Date: 2020-01-06 Impact factor: 3.117