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Title: Interobserver Agreement of Electrode to Retina Distance Measurements in a Second-Generation (44-Channel) Suprachoroidal Retinal Prosthesis
Authors: Abbott, Carla
Baglin, Elizabeth
Kolic, Maria
McGuinness, Myra
Titchener, Samuel
Young, Kiera
Yeoh, Jonathan
Luu, Chi
Ayton, Lauren
Petoe, Matthew
Allen, Penelope
Keywords: Electrodes
Observer Variation
Retina/diagnostic imaging
Tomography, Optical Coherence/methods
Visual Prosthesis
Issue Date: Sep-2022
Publisher: Translational Vision Science & Technology
Citation: Abbott CJ, Baglin EK, Kolic M, McGuinness MB, Titchener SA, Young KA, Yeoh J, Luu CD, Ayton LN, Petoe MA, Allen PJ. Interobserver Agreement of Electrode to Retina Distance Measurements in a Second-Generation (44-Channel) Suprachoroidal Retinal Prosthesis. Trans Vis Sci Tech. 2022;11(9):4. doi:10.1167/tvst.11.9.4
Abstract: Purpose: The electrode to retina (ER) distance is an important contributory factor to the safety and efficacy of a suprachoroidal retinal prosthesis. Measuring ER distance may be performed by different observers during multisite studies. The aim of this study was to assess the interobserver agreement in measuring ER distance. Methods: Three independent, trained observers measured ER distance from the center of each suprachoroidal electrode to the inner retinal pigment epithelium in spectral-domain optical coherence tomography (SD-OCT) B-scans. A total of 121 ER distance measurements from 77 B-scans collected over 5 months from one subject implanted with a second-generation 44-channel suprachoroidal retinal prosthesis (NCT03406416) were made by each observer. Results: ER distance ranged from 208 to 509 µm. Pearson's correlation coefficient (ρ) showed agreement of 0.99 (95% confidence interval [CI] = 0.98–0.99) in measuring ER for each pairwise comparison. The mean difference in ER distance between observers ranged from 2.4 to 6.4 µm with pairwise limits of agreement (95% CI) of ±20 µm (5.5% of mean). Intraclass correlation coefficient (ICC) showed agreement of 0.98 (95% CI = 0.97–0.99) between observers. Conclusions: There is high agreement in measuring ER distances for suprachoroidal retinal prostheses using our systematic approach between multiple, trained observers, supporting the use of a single observer for each image. Translational Relevance: High interobserver agreement outcomes indicate that multiple, trained observers can be used to take ER measurements across different images in suprachoroidal retinal prosthesis studies. This improves multisite study efficiency and gives confidence in interpreting results relating to the safety and efficacy of suprachoroidal retinal prostheses.
URI: http://repository.bionicsinstitute.org:8080/handle/123456789/422
ISSN: 2164-2591
Appears in Collections:Bionic Vision Research Publications

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