Elongation of photoreceptor outer segment in central serous chorioretinopathy

PURPOSE: To investigate photoreceptor segment morphologic changes at the detached retina in central serous chorioretinopathy (CSC). DESIGN: Observational case series. METHODS: We measured and compared the distance between the internal limiting membrane (ILM) and the external limiting membrane (ELM), between the ELM and the photoreceptor inner and outer segment junction (IS/OS) at the central fovea, and the length of the longest outer segment in 20 consecutive CSC eyes and 10 normal eyes on Fourier domain optical coherence tomography (FD-OCT) images. We evaluated the correlation between the length of the outer segment and age, best-corrected visual acuity (BCVA), and symptom duration in CSC eyes and the correlation between retinal thickness from the ILM to ELM and the other parameters. 0 RESULTS: The median distance between the ILM and ELM was 75 mu m in the CSC eyes and was significantly (P =.0001) shorter than the median 135 mu m in normal eyes. The median distance between the ELM and IS/Os was 35 mu m in normal eyes and CSC eyes. The median longest outer segment length in CSC eyes was 90 mu m and was significantly (P =.01) longer than the 60 mu m in normal eyes. The outer segment length was not or weakly correlated with age (r(s) = 0.38), BCVA (r(s) = 0.09), or symptom duration (r(s) = 0. 19). The distance between the ILM and ELM was weakly correlated with age (r(s) = 0.34), BCVA (r(s) = 0.34), or symptom duration (r(s) = 0.28). CONCLUSIONS: FD-OCT showed elongation of photoreceptor outer segments and decreased thickness of the outer nuclear layer in CSC.