Micropulse Laser Photocoagulation Treatment of Diabetic Macular Edema ; 5 % Versus 15 % Duty Cycle

prospective interventional randomized comparative study that will be conducted on Patients with diabetic retinopathy who Are More than 18 years old with diabetic macular edema with a central retinal thickness < 400 um and best corrected visual acuity between 6/18 and 6/60 .

The participants will be divided randomly into two groups All Patients will receive single session of 532 nm subthreshold micropulse laser ,the following parameters will be used in all cases as follows,spot size : 200-µm ,exposure duration:200-ms ,power : 500-mW

While duty cycle will differ between 2 groups as follows :- Group A : will be treated using 5 % duty cycle . Group B : will be treated using 15 % duty cycle . follow up visits as follows 1 week ,4 weeks 12 weeks after laser therapy .