Abstract
Asymptomatic visual loss is a feature of multiple sclerosis (MS) but its relative impact on distinct retinocortical pathways is still unclear. The goal of this work was to investigate patterns of subclinical visual impairment in patients with MS with and without clinically associated previous optic neuritis (ON). We have used functional methods that assess parvo-, konio- and magnocellular pathways in order to compare pathophysiological mechanisms of damage in a population of 44 subjects with MS (87 eyes), with and without a previous episode of ON. These methods included chromatic contrast sensitivity across multiple chromatic axes (Cambridge Colour Test–parvo/konio pathways), perimetric achromatic contrast sensitivity for the magno pathway [frequency doubling technique (FDT)] and pattern visual evoked potentials (VEP). These measures were correlated with field sensitivity measures obtained using conventional automated static perimetry (ASP) and were also compared with conventional clinical chromatic/achromatic contrast sensitivity chart-based measures. We have found evidence for uncorrelated damage of all retinocortical pathways only in patients with MS without ON. VEP evidence for axonal damage was found in this group supporting the emerging notion of axonal damage even in sub-clinical stages of ON/MS pathophysiology. Only in this group was significant correlation of functional measures with disease stage observed, suggesting that distinct pathophysiological milestones are present before and after ON has occurred.
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Acknowledgments
This research was funded by grants from the Portuguese Science and Technology Foundation (FCT): PTDC_SAU_NEU_68483_2006 and PIC/IC/82986/2007, as well as by the National Brain Imaging Network of Portugal (BIN).
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The authors declare that they have no conflict of interest.
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Reis, A., Mateus, C., Macário, M.C. et al. Independent patterns of damage to retinocortical pathways in multiple sclerosis without a previous episode of optic neuritis. J Neurol 258, 1695–1704 (2011). https://doi.org/10.1007/s00415-011-6008-y
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DOI: https://doi.org/10.1007/s00415-011-6008-y