AIM: To evaluate the effects of burst mode, ozil burst mode and ozil continue mode in phacoemulsification for cataract extraction.

METHODS:Totally 159 eyes with age related cataract in Ⅲ-Ⅳ nuclear subgroup treated by phacoemulsification were divided into burst mode group(41 eyes), ozil burst mode group(63 eyes)and ozil continue mode(55 eyes). The number of corneal edema cells before the operation and two weeks after the operation, and the loss rate of corneal edema cells, cumulative dissipated energy(CDE)in phacoemulsification and the best-corrected visual acuity on the second week were compared among the three groups.

RESULTS:Two weeks after operation, the CDE in burst mode for Ⅲ nuclear subgroup and Ⅳ nuclear subgroup were obviously lower than the result of ozil burst mode and that of ozil continue mode(P<0.05), and the differences were statistically significant. Endothelial cell loss rate postoperatively for Ⅲ nuclear subgroup was higher in the burst mode than that in the ozil burst mode and that in the ozil continue mode. So does that of the Ⅳ nuclear subgroup. Best-corrected visual acuity on the second week after treatment of burst mode, ozil burst mode and ozil continue mode for both Ⅲ nuclear subgroup and Ⅳ nuclear subgroup had no statistically significant differences among the three groups(P>0.05).

CONCLUSION:Burst mode, ozil burst mode and ozil continue mode are all safe and effective for the phacoemulsification on cataract. The efficiency of cataract surgery with ozil burst mode and ozil continue mode are better than that with burst mode, and they can protect endothelial cell better.