Abstract
Foveal thickness may be a more sensitive indicator of primary retinal pathology than retinal nerve fiber layer thickness since the fovea contains no or sparse retinal nerve fiber layer, which coalesces into axons of the optic nerve. To our knowledge, few quantitative in vivo studies have investigated foveal thickness. By using optical coherence tomography, we measured foveal thickness to evaluate intrinsic retinal pathology. Seventy-two neuromyelitis optica spectrum disorder patients (99 eyes with optic neuritis and 45 eyes without optic neuritis) and 34 age-matched controls were included. Foveal thinning was observed both in eyes with non-optic neuritis (185.1 µm, p < 0.001) and optic neuritis (185.0 µm, p < 0.001) relative to controls (205.0 µm). Compared to controls, eyes with non-optic neuritis did not have peripapillary retinal nerve fiber layer thinning, but showed foveal thinning (p < 0.001). In neuromyelitis optica spectrum disorder, foveal thickness correlated with 2.5 % low contrast visual acuity, while retinal nerve fiber layer thickness correlated with high or low contrast visual acuity, extended disability status scale, and disease duration. In this study, we observed foveal thinning irrespective of optic neuritis; thus, we believe that subclinical primary retinal pathology, prior to retinal nerve fiber layer thinning, may exist in neuromyelitis optica spectrum disorder.
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This study was supported by Korea Research Foundation Grant funded by Korea Government (KRF 2009-0067502) to Kim NH.
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Dr. Jeong IH, Dr. Jeong KS, and Dr. Park CY report no disclosures. Dr. Kim NH has given talks and received honoraria from Bayer Schering Pharma, Merck Serono, and UCB. Dr. Kim HJ has given talks, consulted and received honoraria from Bayer Schering Pharma, Biogen, Genzyme, MedImmune, Merck Serono, Novartis, Teva-Handok, and UCB; received a grant from the Ministry of Science, ICT & Future Planning and research funding from Genzyme, Kael-GemVax, Merck Serono, Teva-Handok, and UCB. He serves on a steering committee for MedImmune and as an editor for Multiple Sclerosis Journal—Experimental, Translational and Clinical.
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The ethics committees of all participating institutions approved the study. Ethical standards were consistent with the 1964 Declaration of Helsinki and its later amendments.
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Jeong, I.H., Kim, H.J., Kim, NH. et al. Subclinical primary retinal pathology in neuromyelitis optica spectrum disorder. J Neurol 263, 1343–1348 (2016). https://doi.org/10.1007/s00415-016-8138-8
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DOI: https://doi.org/10.1007/s00415-016-8138-8