This is a double blind randomized monocentric clinical trial. The aim of this study is the evaluation of the effect of intravitreal Bevacizumab alone or in combination with Diclofenac in improvement of macular edema in diabetic patients. 68 eyes of eligible patients according to inclusion criteria (such as diagnosed as center involving diabetic macular edema (DME) case, has no history of previous surgery or intraocular injection, visual acuity between 20/320 to 20/40) were enrolled randomly. After obtaining informed consent, complete ocular examination is done included of best corrected visual acuity (BCVA), refraction, slit lamp biomicroscopy, tonometry, fundoscopy, fundus photography, fluorescein angiography, optical coherence tomography. After that the eyes are randomly grouped for intravitreal injection of either Bevacizumab (1.25 milligrams in 0.1 milliliter) or Bevacizumab (1.25 milligrams in 0.1 milliliter) and Diclofenac (300 micrograms/0.1 milliliter). Visual acuity, central macular thickness, macular volume, intraocular pressure and refraction are evaluated both before and one month after injection.