Document Detail


High-Resolution In Vivo Imaging in Achromatopsia.
MedLine Citation:
PMID:  21211844     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE:: To characterize the retinal changes in patients with achromatopsia using an ultrahigh-resolution (UHR) spectral-domain optical coherence tomography (OCT) to examine how human achromatopsia corresponds to its animal model. DESIGN:: Comparative case series. PARTICIPANTS AND CONTROLS:: Ultrahigh-resolution OCT (Copernicus; OPTOPOL Technology S.A., Zawiercie, Poland; 3-μm axial resolution) was used to obtain scans from 13 patients (26 eyes) with achromatopsia and from 20 controls (40 eyes). METHODS:: A 3-dimensional scan program (743×75; A×B scan) sampling a 7×7-mm retinal area centered at the fovea was used to obtain tomograms of the fovea. Individual B-scans at the fovea were exported and analyzed using ImageJ (Wayne Rasband, National Institute of Health) for reflectance profiles and morphologic abnormalities. MAIN OUTCOME MEASURES:: Gross morphologic changes in OCT were characterized. Specifically, inner segment and outer segment (IS/OS) junction and cone outer segment tip (COST) disruption was noted. Using the reflectance profiles, foveal depth, thickness of the outer nuclear layer (ONL), and retinal thickness (RT) were measured. RESULTS:: A characteristic so-called punched out hyporeflective zone (HRZ) was noted in 7 of 13 patients; this was age-dependent (P = 0.001). The area of the HRZ was asymmetric with the nasal area being significantly greater than the temporal area (P = 0.002). In all patients, there was disruption of the IS/OS junction at the foveal or parafoveal regions, or both. Five of 13 patients also had a disrupted COST reflectivity. There was significant (P = 1.1×10(-6)) ONL thinning in the achromats compared with controls, which was age-dependent (P = 0.0002). Foveal maldevelopment was seen in 9 of 13 patients. The achromats also had a significantly reduced foveal depth (P = 7.7×10(-6)) and RT (P = 1.46×10(-9)) compared with controls. CONCLUSIONS:: A range of signs in achromatopsia are described that can be detected using UHR OCT. The IS/OS junction and COST reflectivity disruption and presence of HRZ and ONL thinning are signs of cone photoreceptor degeneration. The latter 2 are age-dependent, which suggests that achromatopsia is a progressive disorder. In addition, foveal maldevelopment is described; this represents a fetal developmental defect linked to cone photoreceptor degeneration. FINANCIAL DISCLOSURE(S):: The author(s) have no proprietary or commercial interest in any materials discussed in this article.
Authors:
Mervyn G Thomas; Anil Kumar; Susanne Kohl; Frank A Proudlock; Irene Gottlob
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-6
Journal Detail:
Title:  Ophthalmology     Volume:  -     ISSN:  1549-4713     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-2-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802443     Medline TA:  Ophthalmology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 American Academy of Ophthalmology. Published by Elsevier Inc. All rights reserved.
Affiliation:
Ophthalmology Group, School of Medicine, University of Leicester, Leicester, United Kingdom.
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