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Relationship between LENSAR opacities classification system and overall ultrasound energy required for extraction when using a diced lens fragmentation pattern

Poster Details

First Author: L.Mastropasqua ITALY

Co Author(s):    P. Mattei   L. Toto   L. Vecchiarino   A. Mastropasqua   E. Doronzo  

Abstract Details


to determine if the automated LensAR grading system based on lens transparency used to determine the overall quantity of laser energy required for cataract fragmentation effected the overall ultrasound energy required for extraction.


Ophthalmology Clinic, University 'G. d'Annunzio' Chieti-Pescara


The Opacities Classification System (OCS) used by LensAR systems has six grades: from 1 to 6 with increasing opacity. We enrolled 12 consecutive patients per grade who underwent femtosecond laser-assisted cataract surgery with a diced lens fragmentation pattern. The main outcome parameter was overall ultrasound energy (OUE) required for extraction. Statistical analysis was performed with Analysis of variance (ANOVA) and students t-test for post-hoc evaluations.


Preliminary results indicated that the observed OUE increased with increasing OCS grades (ANOVA, not statistically significant). The increase became statistically significant only for grades 5 and 6 (students t-test compared to grade 4 and 5, p=0.372 and p=0.017, respectively).


Preliminary results indicate that the OCS-corrected laser energy levels used to fragment the lens adequately compensate for lens characteristics up to grade 4. Grades 5 and 6 are probably limited by their increased opacity and will probably require the development of a new cut pattern. Possible benefits obtained when reducing ultrasound energy while increasing laser energy will require further evaluation. FINANCIAL INTEREST: NONE

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