Visual Acuity in Birdshot Retinochoroidopathy Evaluation.

Abstract

To determine the statistical correlation between visual acuity (VA) and various quantitative parameters relevant to birdshot retinochoroidopathy (BRC) evaluation. Hospital-based retrospective observational study. setting: Institutional. Consecutive HLA29+ BRC patients were included between May and August 2013 at a single tertiary center (Pitié-Salpétrière Hospital, Paris). 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. Correlation between VA and the other parameters of the ipsilateral and fellow eye was performed using Spearman rank correlation coefficients. Fifty-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). In BRC, visual acuity alone does not seem to fully reflect the disease severity in terms of clinical or ancillary quantitative findings at baseline.