{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T06:33:08Z","timestamp":1786689188647,"version":"build-2736575974"},"reference-count":29,"publisher":"Korean Ophthalmological Society","issue":"4","license":[{"start":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T00:00:00Z","timestamp":1775174400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["RS-2025-00553501"],"award-info":[{"award-number":["RS-2025-00553501"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["RS-2025-16063013"],"award-info":[{"award-number":["RS-2025-16063013"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["ekjo.org"],"crossmark-restriction":true},"short-container-title":["Korean J Ophthalmol"],"published-print":{"date-parts":[[2026,8,5]]},"abstract":"<jats:p>Purpose: To evaluate early choroidal microvascular alterations in diabetic eyes without clinically detectable retinopathy using optical coherence tomography angiography (OCTA), with quantitative analysis of choriocapillaris (CC) flow voids and en face Haller layer metrics.Methods: This study included 102 eyes divided into three groups: healthy controls, diabetic patients without diabetic retinopathy (DR) (no DR group), and those with nonproliferative DR (NPDR group). Spectral-domain optical coherence tomography (OCT) and swept-source OCT were used to assess CC voids, Haller layer vessels, and subfoveal choroidal thickness (SFCT).Results: The average size and total area of CC voids significantly increased with DR severity, indicating early microvascular impairment. In contrast, there were no significant differences in the thickness or area of Haller layer vessels among the groups. CC void changes were independent of SFCT.Conclusions: CC void parameters may serve as early imaging biomarkers of diabetic choroidopathy, even before the development of DR. 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