• Kyung Tae Kang, Ji Hye Jang, and Yu Cheol Kim.
• Department of Ophthalmology, Keimyung University School of Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea.
• Medicine (Baltimore). 2021 Jun 18; 100 (24): e26355e26355.

AbstractSeveral macular pathologies are associated with choroidal vascular supply and thus require choroidal thickness evaluation. However, there is no standard subfoveal choroidal thickness (SFCT) measurement method. This study investigated a new method of SFCT measurement, using optical coherence tomography.This is a single-center observational study. Eighty-two senior medical students participated as observers and independently measured the SFCT on 5 standard optical coherence tomography images of healthy adults in a tertiary care setting. They used 3 different methods: the observer's own method, the conventional method, perpendicular to the retinal pigment epithelium, and the new method, along a virtual line connecting the umbo with the most elevated point of the ellipsoid. Additionally, the SFCT angle-the angle between the measurement line and the vertical line of the image-was measured and compared between methods. The intraclass correlation coefficient was used to determine interpersonal variability.The intraclass correlation coefficients for SFCT, measured using methods 1, 2, and 3, were 0.853, 0.880, and 0.896, respectively (P < .001 for all). Method 3 was the highest. The intraclass correlation coefficients of the SFCT angles were 0.647, 0.842, and 0.307, respectively (P < .001 for all).The new method showed the lowest interpersonal variability and could therefore be a reliable standard for SFCT measurement, even in foveae with a steep slope on optical coherence tomography.Trial registration: Not applicable.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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