Purpose: To assess the central macular thickness after phacoemulsification surgery. Methods: Twenty eyes of 15 non-diabetic, more than 40 years old patients, who underwent uneventful phacoemulsification, central macular thickness using swept source optical coherence tomography was estimated preoperatively and four weeks postoperative. Results: The central macular thickness increased with highly significant degree from (248.35 ± 30.10) preoperative to (271.90 ± 36.49) four weeks postoperative (p=0.006), only one eye developed cystoid macular edema representing 5% of patients. There was high significant improvement of visual acuity. The BCVA increased highly significant from 0.67 ± 0.21 on log MAR preoperatively to 0.38 ± 0.231week post operatively and to 0.24 ± 0.23 four weeks postoperatively (p=0.000). Conclusion: There was a significant increase in CMT 4 weeks postoperatively.