This study aimed to investigate the progression of macular edema in diabetic patients after cataract surgery. The inclusion criteria comprised of diabetic patients with or without various grades of retinopathy of both sexes between age 30-80 years with visual acuity less than 6/18. Exclusion criteria includes preexisting retinopathy other than diabetic retinopathy, primary glaucoma, patient having severe retinopathy with fluid retention or on dialysis and Patients with uncontrolled hypertension, severe anemia. It was Prospective observational study conducted in RIO, GMCH from Jan 2023 to dec 2023 involving thorough examination and imaging studies of patients undergoing cataract surgery. Sixty patients were included in the study who underwent optical coherence tomography testing within 4 weeks before surgery and 1 and 3months postoperative visits. Best corrected visual acuity was recorded during each visit. Macular edema was defined as an increase of center point thickness on OCT>30% from preoperative baseline. Main outcome measures changes in foveal thickness and BCVA. Conclusion- Diabetic eyes have high incidence of increased center point thickness on OCT after cataract surgery, associated with deterioration of vision.