Document Detail


Macular pigment parameters in patients with macular telangiectasia (MacTel) and normal subjects: implications of a novel analysis.
MedLine Citation:
PMID:  22899764     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To evaluate the spatial distribution and total amount of macular pigment (MP) in patients with idiopathic macular telangiectasia type 2 (MacTel) compared to healthy subjects.
METHODS: Totals of 53 MacTel patients and 38 normal subjects underwent macular pigment optical density (MPOD) measurement using a 2-wavelength autofluorescence (2-AF) technique. The peak MPOD and total MP (sum of pixel OD values) were measured within the central 21 degrees. Data were correlated with motion photometry in a cohort of normal subjects.
RESULTS: A Bland-Altman analysis revealed minimal differences between psychophysical and 2-AF measurements of MPOD (bias = 0.025, SD = 0.06, N = 156 values). In the normal comparison group, 2-AF MPOD peak had a median value of 0.57 (range 0.21-0.93), and median eccentricity of the peak was 0.19 degrees (range 0.00-0.41). In the MacTel group, MPOD peak had a median value of 0.08 (range 0.01-0.26), and median eccentricity of the peak was 5.04 degrees (range 0.18-7.27). The median total amount of MP within the central 21 degrees was greater for normal subjects (4802, range 2362-9215) than for the patients (2938, range 142-7198), but there was marked overlap between the groups. Comparison of the total amount within the central 8, 12, or 16 degrees to that within the central 21 degrees revealed underestimation of up to 68% (median 53%), 42% (27%), and 24% (8%), respectively.
CONCLUSIONS: Most MacTel patients have a normal total complement of MP with an abnormal paracentral distribution. The study highlights the limitations of MP measurement techniques that assume minimal MP at eccentricities less than 10.5 degrees.
Authors:
Simona Degli Esposti; Catherine Egan; Catey Bunce; Jack D Moreland; Alan C Bird; Anthony G Robson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-25
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  53     ISSN:  1552-5783     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-26     Completed Date:  2012-12-12     Revised Date:  2013-01-09    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6568-75     Citation Subset:  IM    
Affiliation:
Moorfields Eye Hospital, London, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Aged
Humans
Lutein / metabolism*
Macula Lutea / metabolism*
Microscopy, Confocal
Middle Aged
Photometry / methods
Retinal Pigments / metabolism*
Retinal Telangiectasis / metabolism*
Xanthophylls / metabolism*
Young Adult
Chemical
Reg. No./Substance:
0/Retinal Pigments; 0/Xanthophylls; 127-40-2/Lutein; 144-68-3/zeaxanthin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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