Diameters and Wall-to-lumen Ratio of Retinal Arterioles in Patients With Retinal Vein Occlusion.

Inclusion Criteria: * ability to provide written informed consent and comply with study assessments for the full duration of the study; * age \> 20 years; * decreased visual acuity as a result of clinically detectable ME associated with either CRVO or BRVO; * the duration of macular edema was required to be between 4 and 24 weeks for both CRVO and BRVO; * retinal thickness in the central subfield (as measured using optical coherence tomography) had to be \> 350 µm in the study eye. Exclusion Criteria: * the exclusion criteria were as follows: diabetes; previous intravitreal anti-VEGF therapy or intravitreal steroid therapy; previous photodynamic therapy or focal laser; active retinal or optic disc neovascularization; active or history of choroidal neovascularization; presence of rubeosis iridis; any active infection; glaucoma, current ocular hypertension, or a history of steroid-induced intraocular pressure (IOP) increase in either eye; or concurrent eye disease in the study eye that could compromise visual acuity (e.g., choroidal neovascularization, diabetic retinopathy, epiretinal membrane).