The goal of this prospective non-interventional clinical study was to evaluate the role of OCT-A parameters in determining early changes that occur in DM patients following cataract surgery to be aware about early microvascular changes occurring & when to interfere to prevent complications of DR. The study was carried out on 30 eyes of cataractous diabetic patients without DR & 30 eyes of cataractous non diabetic patients, both underwent phaco. Patients were selected according to inclusion & exclusion criteria then complete ophthalmologic evaluation was done (history, examination and investigations). OCT-A was carried out for study groups before &during follow up after one week, one month &three months after surgery. The study showed that there was a significant increase in foveal & parafoveal thickness after three months in comparison with preoperative values & control group by 12±8.97foveal/ 11.40±3.99 parafoveal(p-value