Visual Acuity in Birdshot Retinochoroidopathy Evaluation

PurposeTo determine the statistical correlation between visual acuity (VA) and various quantitative parameters relevant to birdshot retinochoroidopathy (BRC) evaluation.DesignHospital-based retrospective observational study.Methodssetting: Institutional. study population: Consecutive HLA29+ BRC patients were included between May and August 2013 at a single tertiary center (Pitié-Salpétrière Hospital, Paris). observation procedures: Demographic data and quantitative parameters relevant to BRC at baseline were collected: VA, degree of anterior and posterior inflammatory reaction, foveal thickness measured by optical coherence tomography (OCT), Arden ratio, and electrooculography (EOG) light peak. main outcome measures: Correlation between VA and the other parameters of the ipsilateral and fellow eye was performed using Spearman rank correlation coefficients.ResultsFifty-five patients were included. Mean VA was 6/9.5 in the right eye (OD) and 6/12 in the left eye (OS). Mean foveal thickness was 240 μm OD (range: 112-606) and 251 μm OS (range: 85-662). Mean Arden ratio was 159% OD and 160% OS. EOG light peak was 714 mV OD (range: 316-1379) and 746 mV OS (range: 272-1652). VA of a given eye was moderately correlated with VA of the contralateral eye (r = 0.4). On the contrary, all other parameters showed a strong correlation between both eyes (all r > 0.7, P < .01). Overall, none of the studied parameters was correlated with its VA (all r < 0.5).ConclusionIn BRC, visual acuity alone does not seem to fully reflect the disease severity in terms of clinical or ancillary quantitative findings at baseline.