P 639
Comparison of two systems for pco evaluation
C. Nimsgern, M. R. Tetz
Introduction: Computerized systems for (semi-) quantitative pco evaluation differ concerning their strategy.
Material & Method: We compared the results of 30 retroillumination pco images that were evaluated by two systems: the "London System"(=LS) described by Hollick/Spalton and the software EPCO.
The LS evaluates pco quantitatively within the capsulorhexis (max. 100%) whereas EPCO allows evaluation within the capsulorhexis or of total IOL, quantitatively or qualitatively by taking density aspects into account. Three evaluation strategies of EPCO were compared statistically with those of the LS.
Results: The comparison of LS and EPCO showed no statistically significance concerning pco values (evaluation of total IOL area, p=0,39, Wilcoxon-Test matched pairs). PCO comparison within capsulorhexis showed a minor comparability (p=0,053 Wilcoxon matched pairs test). In general a good correlation of pco values in both systems was expressed by the Spearman rang correlation of 0,58-0,6. This was statistically highly significant (p<0,005).
Discussion: Both systems show a good correlation and should render similar results. Evaluation with EPCO is more flexible and takes qualitative pco aspects into account. One reason for the few differences of both systems in this trial could be found in the moderate pco growth and the short follow up period of 6 month. Further studies with extended series and longer follow up are ongoing.
Universitäts-Augenlklinik Charité, Campus Virchow Klinikum, Augustenburger Platz 1, D-13353 Berlin