Analysis of therapeutic effect of phacoemulsification through 3 different clear corneal incisions

Objective To investigate the therapeutic effect of phacoemulsification through 3 different corneal incisions(superior incision,temporal incision and incision guided by corneal topography system).Methods Totally 120 eyes underwent phacoemulsification with corneal incision were randomly divided into 3 groups(n=40): group A(incision at the steepest corneal meridian as guided by corneal topography system),group B(temporal incision) and group C(superior incision).The changes of corneal astigmatism and uncorrected visual acuity were determined before and 1 week,1 month and 3 months after operation.Results Five eyes were lost during follow-up.Group A had 35 patients(38 eyes),group B had 37 patients(40 eyes) and group C had 35 patients(37 eyes).The uncorrected visual acuities were similar between the 3 groups before and 1 week after operation(P0.05).One month and 3 months after operation,the visual acuities in group A were better than those of the Group B and C(both P0.05);and there was no significant difference between the latter 2 groups.In group A the astigmatisms were(0.97±0.35),(1.21±0.32),(1.17±0.26) and(1.03±0.27) D before,1 week,1 month,and 3 months after operation,respectively;in group B the numbers were(1.03±0.19),(1.56±0.37),(1.54±0.37),and(1.37±0.28) D,respectively,and in group C were(1.05±0.24),(1.52±0.13),(1.48±0.10) and(1.29±0.13) D,respectively.One month and 3 months after operation,the astigmatism in group A was lower than in group B and group C(all P0.05).The phacoemulsification time in group B was shorter than those in group A and C(P0.05).Conclusion The incision at the steepest corneal meridian guided by corneal topography system can reduce post-operation astigmatism and improve visual acuity.The temporal side incision is easy to perform.