Comparison of Intravitreal Ranibizumab and Macular Laser Photocoagulation for ME Following Branch Retinal Vein Occlusion (BRVO)

Inclusion Criteria: * Symptom duration \< 6 Months, \> 4 weeks * Visual acuity - less than 20/40 (73 letters) more than 20/400 (19 letters) in ETDRS chart * OCT - center involved retinal thickening : \> 250 micrometers * clear media * well controlled hypertension (\<140/90mmHg) and diabetes (6.5\<HbA1c\<9.5) * willing to return for all scheduled visits Exclusion Criteria: * uveitis,NVG, exudative AMD, diabetic retinopathy, Irvine-Gass syndrome, OIS * any malignancy * previous treatment history - laser photocoagulation, intravitreal injection with any drug, vitrectomy * vitreomacular traction or epiretinal membrane * intraocular surgery in the study eye within 6 months * uncontrolled glaucoma ( \> 30mmHg with anti-glaucoma medications) * optic neuropathy, amblyopia * A condition that in the opinion of the investigator would preclude a patient's participation in the study