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B. T. Chan-Kai, S. Yeh, J. R. Smith, C. J. Flaxel, A. K. Lauer, J. T. Rosenbaum, E. B. Suhler; Correlation of Visual Acuity and Optical Coherence Tomography Findings in Patients With Birdshot Chorioretinopathy. Invest. Ophthalmol. Vis. Sci. 2009;50(13):6036.
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We conducted a retrospective, nonconsecutive, cross-sectional case series to correlate macular optical coherence tomography (OCT) features with visual acuity (VA) in patients with birdshot chorioretinopathy (BSCR).
The OCT features and medical records of 17 patients with BSCR presenting to the Casey Eye Institute/Oregon Health and Science University were reviewed. VA was correlated with the presence of intraretinal fluid, foveal atrophy, or parafoveal atrophy.
34 eyes of 17 patients were reviewed. The mean age was 60.8 years (range 30-82 years) and mean logMAR VA was 0.36 (range 0.0-1.3). Mean central subfield thickness (CST) was 220 microns (range 145-643 microns). 27 (79%) eyes showed central foveal atrophy, parafoveal atrophy, or intraretinal fluid. 14 (41%) eyes had central foveal atrophy and 15 (44%) eyes showed parafoveal atrophy. The mean CST in patients with any retinal atrophy was 181 microns. 6 (18%) eyes exhibited diffuse cystoid macular edema, and 10 (29%) eyes had cystoid changes limited to the foveal and parafoveal regions. The mean CST for eyes exhibiting macular edema was 279 microns. The mean logMAR VA of eyes affected by either atrophy or intraretinal fluid was 0.41. 7 (21%) eyes showed normal architecture and laminations of the retinal layers with a mean CST of 202 microns, and the average logMAR VA was 0.16 (range 0-0.4). Eyes with any form of architectural abnormality (intraretinal edema, foveal or parafoveal atrophy) demonstrated significantly poorer VA than eyes with normal architecture and thickness (p < 0.05).
Patients with BSRC exhibit a range of OCT findings including foveal atrophy, parafoveal atrophy, and retinal edema, which are correlated with VA loss. Retinal atrophy may occur as a result of chronic, recurrent macular edema. Some patients presented with retinal atrophy in the absence of documented edema, which might reflect either resolved macular edema or other pathogenic mechanisms.
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