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AIM: To compare the efficiency of coaxial micro-incision cataract surgery(MICS)performed by 3 phacoemulsification techniques(phaco-chop, divide-and- conquer and stop-and-chop).METHODS: It was a perspective and randomized clinical trial. Totally 135 patients with age-related cataract were selected randomly and underwent MICS. According to the lens nuclear opacity(NO)of LOCSⅢ grading standards, it can be divided into 3 groups as NO2, NO3 and NO4 group. All groups were randomly subdivided into 3 groups(phaco-chop, divide-and-conquer and stop-and-chop group). The observation target included best-corrected visual acuity(BCVA), central corneal thickness(CCT)and endothelial cell count(ECC)before operation and 1mo postoperation, ultrasound time(UST), cumulative dissipated energy(CDE), estimated fluied used(EFU)in operation and complications.RESULTS:In lens nuclear opacity NO4 coaxial micro-incision phacoemulsification, phaco-chop group showed significantly less UST, CDE and EFU than the divide-and-conquer and stop-and-chop groups(P<0.05)and the ratio of endothelial cell loss was significantly lower in the phaco-chop group than in the divide-and-conquer and stop-and-chop groups 1mo after surgery(P<0.05). However, after 1mo surgery, BCVA and CCT among three chop technique groups in different lens nuclear opacity groups had no significant differences(P>0.05).CONCLUSION: All 3 techniques may be effective for coaxialmicroincision cataract surgery in mild and moderate nuclear opacity cataracts. However, in eyes with severe nuclear opacity cataract, the phaco-chop technique can be more effective for phacoemulsification, and less corneal endothelial damage.

AIM:To compare and evaluate the efficiency and safety of ozil torsional mode coaxial microphacoemulsification and conventional phacoemulsification in hard nuclear cataract.METHODS: It was a prospective and randomized clinical trial. A total of 209 eyes(209 cases)with grade 4 nuclear cataract were randomly assigned into either ozil torsional mode coaxial or conventional group(104 eyes)to undergo microphaco. Best-corrected visual acuity(BCVA), intraocular pressure(IOP), central anterior chamber depth(ACD), endothelial cell count(ECC)before operation and cumulative dissipated energy(CDE), esstimated fluied used(EFU)in operation and complications were recorded. BCVA, IOP, ACD and ECC at 1 day, 1 week, 1 month after operation were compared and statistically analyzed. RESULTS: The values of BCVA, IOP, ACD and ECC of experimental group were lower than those of conventional group before operation, there was no statistically significant differences(P>0.05). The values of CDE and EFU in ozil torsional mode coaxial group were less than that in the conventional group. The differences among two groups had statistical significance(PP=0.11). The ECC at 1 month after operation of two groups was obviously reduced(15%-30%)with a statistically significant difference in the degree of reduction.(PCONCLUSION: The anterior chamber stability was better in ozil torsional mode coaxial microphacoemulsification for hard nuclear cataract, with a significant reduction in the ultrasonic energy and the phaco time. The method can reduce the amount of fluid used in operation, with less ECC loss after operation, which can promote the rapid recovery of vision.