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Disease activity and severity were graded using European Group on Graves\u2019 Orbitopathy standardised criteria. SFCT values were determined by SS-OCT.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In total, 129 eyes were included in the final analysis. The mean SFCT was significantly thicker among patients with active disease (276.23\u00b184.01\u2009\u00b5m) than among patients with inactive disease (224.68\u00b1111.61\u2009\u00b5m; p=0.049) or healthy controls (223.56\u00b178.69\u2009\u00b5m; p=0.01). There were no differences in SFCT among patients with moderate-to-severe disease, patients with severe disease and healthy controls (p&gt;0.05). Changes in SFCT demonstrated strong predictive ability to distinguish active TAO from inactive TAO (area under the curve=0.659, 95% CI 0.496 to 0.822).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>SFCT was strongly associated with Clinical Activity Score in patients with TAO. Choroidal thickening was observed during active TAO. SS-OCT offers a non-invasive method for follow-up assessment.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bjo-2023-323694","type":"journal-article","created":{"date-parts":[[2023,10,19]],"date-time":"2023-10-19T17:24:24Z","timestamp":1697736264000},"page":"1081-1087","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":10,"title":["Choroidal thickness in patients with thyroid-associated ophthalmopathy, as determined by swept-source optical coherence 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