Introduction: Surgically induced astigmatism (SIA) is the most common complication after phacoemulsification. Astigmatism is caused due to the surgery related to the type and size of the incision and suture utilization. Aim: To study SIA caused by a clear corneal incision in phacoemulsification. Method: This is a design longitudinal prospective study. The senile cataract underwent phacoemulsification. Ophthalmologic evaluation included visual acuity, keratometry before and after phacoemulsification on the 7th and 30th day was observed. All operations were performed by one operator. Result: Total 60 patients (male 43.1%, female 56.9%) were included in the study. The mean age was 66.6 (range 44-84) years. The ATR (astigmatism against the rule) group consisted of 45 patients, and the mean keratometry on the 7th day was 0.412 D (p=0.035), and on the 30th day was 0.382 D (p=0.052). The AWR (astigmatism with the rule) group consisted of 20 patients, the mean keratometry on the 7th day was 0.384 D (p=0.192), and on the 30th day was 0.265 D (p=0.333). Post-operation, there were 43 patients in the ATR group, and 22 patients in the AWR group, the ATR group remain unchanged which consisted of 35 patients and AWR group included 12 patients have increased to 18 patients. Wilcoxon test analysis was used to analyze the patients, p=0.637, α=0.05 this difference was not statistically significant. Conclusion: Keratometric change before and after phacoemulsification was not statistically significant.