Investigation of choroidal thickness and choroidal vascularity index in ocular rosacea patients according to skin subtypes.

Background: To compare the choroidal thickness (CT) and choroidal vascularity index (CVI) values in ocular rosacea (OR) patients across skin subtypes of the disease and healthy controls.

Methods: This prospective study included 90 eyes of 90 mild-moderate OR patients with different skin subtypes (30 phymatous, 30 papulopustular and 30 erythematotelangiectatic) and 30 eyes of 30 age-gender matched healthy volunteers. After obtaining the enhanced depth imaging optical coherence tomography images, the CT was measured at subfoveal, 1500 μm nasal and 1500 μm temporal to the fovea, and the CVI was calculated using Image J software in the subfoveal, nasal and temporal areas.

Results: There was no CT significant difference between OR patients and healthy controls in all regions (p > 0.05). CVI values of OR patients were found to be significantly lower in the subfoveal, nasal and temporal regions compared to healthy controls (p = 0.02, p = 0.01, p = 0.01, respectively). No CT difference was detected between the subtypes and healthy controls in all regions (p > 0.05). Subfoveal-CVI was significantly lower in the phymatous subtype than the other subtypes and controls (p < 0.05), while nasal and temporal-CVI were significantly lower in the phymatous and papulopustular subtypes than the erythematotelangiectatic subtype and controls.

Conclusion: Our study demonstrated no difference between rosacea skin types and healthy controls in terms of CT. Phymatous and papulopustular subtypes were more likely to be affected by chronic inflammation with having lower CVI in most of the regions. Further studies are needed to investigate the association of inflammatory factors with CVI in OR.