title: Optical coherence tomography findings in Huntington's disease: a potential biomarker of disease progression.
abstract: Previous reports of ocular abnormalities in Huntington's disease (HD) have detailed eye movement disorders. The objective of this case-control study was to investigate optic nerve and macular morphology in HD using optical coherence tomography (OCT). A total of 26 HD patients and 29 controls underwent a thorough ophthalmic examination including spectral domain OCT scans of the macula and peripapillary retinal nerve fibre layer (RNFL). Genetic testing results, disease duration, HD disease burden scores and Unified HD Rating Scale motor scores were acquired for HD patients. Temporal RNFL thickness was significantly reduced in the HD group (62.3 vs. 69.8 μm, p = 0.005), and there was a significant negative correlation between temporal RNFL thickness and disease duration (R (2) = -0.51, p = 0.04). Average peripapillary RNFL thickness was not significantly different between the HD and control groups. There was a significant negative correlation between macular volume and disease duration (R (2) = -0.71, p = 0.002), and motor scores (R (2) = -0.56, p = 0.01). Colour vision was significantly poorer in the HD group. Temporal RNFL is preferentially thinned in HD patients, possibly implicating mitochondrial dysfunction as the temporal RNFL is reduced in the patients with some mitochondrial disorders, including Leber's hereditary optic neuropathy. The correlation between the decrease in macular volume and temporal RNFL, and increasing disease severity suggests that OCT may be a useful biomarker for disease progression in HD. Larger, longitudinal studies are required.
authors.affiliation: Department of Ophthalmology, University of Auckland, 85 Park Road, Auckland, 1142, New Zealand. h.kersten@auckland.ac.nz.
authors.forename: Hannah M
authors.initials: HM
authors.lastname: Kersten
authors.affiliation: Department of Ophthalmology, University of Auckland, 85 Park Road, Auckland, 1142, New Zealand.
authors.forename: Helen V
authors.initials: HV
authors.lastname: Danesh-Meyer
authors.affiliation: Department of Neurology, Auckland City Hospital, 2 Park Road, Auckland, 1023, New Zealand.|Centre For Brain Research, University of Auckland, 85 Park Road, Auckland, 1142, New Zealand.
authors.forename: Dean H
authors.initials: DH
authors.lastname: Kilfoyle
authors.affiliation: Department of Neurology, Auckland City Hospital, 2 Park Road, Auckland, 1023, New Zealand. richardr@adhb.govt.nz.|Centre For Brain Research, University of Auckland, 85 Park Road, Auckland, 1142, New Zealand. richardr@adhb.govt.nz.
authors.forename: Richard H
authors.initials: RH
authors.lastname: Roxburgh
mesh_terms: D000328:Adult; D000368:Aged; D015415:Biomarkers; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D006816:Huntington Disease / Q000150:complications / Q000473:pathology*; D008266:Macula Lutea / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009412:Nerve Fibers / Q000473:pathology*; D012164:Retinal Diseases / Q000209:etiology / Q000473:pathology*; D055351:Retinal Neurons / Q000473:pathology*; D041623:Tomography, Optical Coherence / Q000379:methods*
chemical_list: D015415:Biomarkers
keywords: Huntington’s disease; Macula; Optical coherence tomography; Retina; Retinal nerve fiber layer