• Mitra Tavakoli, Andy Marshall, Siddharth Banka, Ioannis N Petropoulos, Hassan Fadavi, Helen Kingston, and Rayaz A Malik.
• Division of Cardiovascular Medicine, University of Manchester and Wellcome Trust Clinical Research Facility, Manchester, UK.
• Muscle Nerve. 2012 Nov 1;46(5):698-704.

IntroductionAlthough unmyelinated nerve fibers are affected in Charcot-Marie-Tooth type 1A (CMT1A) disease, they have not been studied in detail due to the invasive nature of the techniques needed to study them. We established alterations in C-fiber bundles of the cornea in patients with CMT1A using non-invasive corneal confocal microscopy (CCM).MethodsTwelve patients with CMT1A and 12 healthy control subjects underwent assessment of neuropathic symptoms and deficits, electrophysiology, quantitative sensory testing, corneal sensitivity, and corneal confocal microscopy.ResultsCorneal sensitivity, corneal nerve fiber density, corneal nerve branch density, corneal nerve fiber length, and corneal nerve fiber tortuosity were significantly reduced in CMT1A patients compared with controls. There was a significant correlation between corneal sensation and CCM parameters with the severity of painful neuropathic symptoms, cold and warm thresholds, and median nerve CMAP amplitude.ConclusionsCCM demonstrates significant damage to C-fiber bundles, which relates to some measures of neuropathy in CMT1A patients.Copyright © 2012 Wiley Periodicals, Inc.

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