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Comparison of two laser fragmentation patterns used in femtosecond laser-assisted lens surgery

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Session Details

Session Title: Presented Poster Session: FLACS & Others

Venue: Poster Village: Pod 1

First Author: : M.Shajari GERMANY

Co Author(s): :    S. Khalil   W. Mayer   G. Al Khateeb   K. Petermann   E. Hemkeppler   T. Kohnen

Abstract Details


To evaluate the effect of fragmentation patterns (pie vs grid pattern) on effective phacoemulsification time (EPT).


Department of Ophthalmology, Goethe-University, Frankfurt, Germany


A total of 150 eyes which underwent femtosecond-laser assisted lens surgery were included in this retrospective analysis. 75 eyes were treated with the pie pattern. Their preoperative lens density was evaluated by Scheimpflug imaging (Pentacam, Oculus). In a second step, eyes which were treated with the grid pattern were matched to the pie-pattern group based on the preoperative lens density. Main outcome measure was the effective phacoemulsification time.


Average patient age was 66 +/-10.67. Preoperative lens density was 10.05% +/-1.52. EPT was 6.64 +/-5.42 for pie pattern, significantly higher than 4.27 +/- 6.99 for grid pattern (P<0.01, Wilcoxon Rank-Sum test). Similarly, number of eyes with EPT=0 was significantly higher with grid pattern (37 for grid vs 1 for pie, P<0.01, Chi2-test). The regression analysis showed that EPT was significantly dependent on lens density for both methods (P=0.045 for pie vs. P<0.01 for grid). In eyes with lens density above 12% (9 eyes in each group), pie pattern showed significantly lower EPT (P=0.02, Wilcoxon rank-sum test).


In cases of low to moderate lens density, grid fragmentation pattern should be used, as EPT is significantly lower and a significantly higher number of eyes did not require further emulsification. However, in eyes with high density (>12%), we recommend switching to pie pattern fragmentation.

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