To assess the safety and efficiency of combined phacoemulsification surgery and intravitreal triamcinolone (IVTA) injection in patients with cataract and diabetic macular edema. This investigation included "40 patients" having youthful decrepit waterfall with clinically critical macular edema. Phacoemulsification was finished with back chamber intraocular focal point implantation and intravitreal triamcinolone infusion. Patients were followed up on day 1,day 3 then week after week for multi month, and from that point month to month for a half year postoperatively. Best adjusted visual keenness (BCVA) and focal macular thickness (CMT), and intraocular pressure (IOP) were recorded. All patients finished a half year of development. Mean BCVA demonstrated factually noteworthy improvement from a standard of 0.08 ± 0.05 decimal to 0.3 ± 0.13 decimal at 3 months and 0.35 ± 0.16 decimal at a half year . Mean CMT diminished essentially from a gauge of 504.85 ± 109.05 μm to 341.10 ± 75.35 μm at 3 months and 322.05 ± 87.40 μm at a half year. IOP was raised in 6 patients (15%) < 21 mmHg one month after infusion in any case, all managed with against glaucoma drugs. No infusion or medical procedure related difficulties were experienced. Phacoemulsification with simultaneous 4 mg IVTA infusion seems, by all accounts, to be a protected and compelling choice for overseeing diabetics with waterfall and CSMO.