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Schematic representation of the study design. Twenty patients diagnosed with KC and presenting Vit D insufficiency (<30 ng/mL) were enrolled. They were followed up for 12 months. Full ophthalmology visits were scheduled at months 0, 2, 4, 6, 9, and 12. In addition, peripheral blood samples were collected to further analyze Vit D levels (at 0, 4, 6, and 12 months) and other biomarkers (at 0 and 6 months).
