| Further analysis of assessments of the coefficient of variation of corneal endothelial cell areas from specular microscopic images. | |
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MedLine Citation:
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PMID: 18537989 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The aim of this study was to compare two methods of assessments of the coefficient of variation (COV) of endothelial cell area. METHODS: A single image (Topcon SP-2000P specular microscope) was obtained from the central region of the corneal endothelium of 45 healthy white (Norwegian) individuals, aged from 24 to 43 years and without a history of major eye disease or surgery. The image file was printed to A3-size, the cell-cell boundaries marked manually and the areas of the cells measured with a digitiser pad. The same image file was independently processed by the semi-automated Topcon IMAGEnet system. From either method, the cell area data from 100 contiguous cells approximately in the middle portion of the images were used to calculate the average cell area (AVG), the coefficient of variation (COV) on the cell areas and the endothelial cell density (ECD). RESULTS: Both methods produced similar AVG and ECD values that were not statistically different (p >or= 0.180). The SD values on the cell areas increased in relation to the AVG values (Pearson's r >or= 0.557). The resultant COV values were only marginally higher with the manual method (27.8 versus. 26.3 per cent) but the limits of agreement (LoA) for the COV values were rather large at -4.9 to +7.9 per cent. CONCLUSION: A semi-automated image analysis system can be used to generate COV data for the corneal endothelium similar to those of a manual method. The limits of agreement between the methods are substantial and this probably reflects the extreme sensitivity of the COV calculation to even a few different cell area values. This poor agreement needs to be considered in any comparative studies. |
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Authors:
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Michael J Doughty; Bente Monica Aakre |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-06-05 |
Journal Detail:
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Title: Clinical & experimental optometry : journal of the Australian Optometrical Association Volume: 91 ISSN: 0816-4622 ISO Abbreviation: Clin Exp Optom Publication Date: 2008 Sep |
Date Detail:
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Created Date: 2008-09-02 Completed Date: 2008-09-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8703442 Medline TA: Clin Exp Optom Country: Australia |
Other Details:
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Languages: eng Pagination: 438-46 Citation Subset: IM |
Affiliation:
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Glasgow-Caledonian University, Department of Vision Sciences, Glasgow, Scotland. m.doughty@gcal.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cell Count Diagnostic Techniques, Ophthalmological / standards* Endothelium, Corneal / cytology* Humans Microscopy / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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