Optical coherence tomography angiography is a modern, non-invasive method for assessing hemodynamics in retinal and choroidal vessels. The study presents changes occurring in optical coherence tomography angiography examination in patients with retinal vein occlusion, before and after therapy with intravitreal anti vascular endothelial growth factor injections. Anti vascular endothelial growth factor therapy in patients with retinal vein occlusion reduces the non-perfusion area, improves retinal blood flow, reduces retinal ischemia, reduces cystoid macularedema, and improves visual acuity.