Lucentis for Macular Edema Associated With Central Retinal Vein Occlusion

Inclusion Criteria: * Ability to provide written informed consent and comply with study assessments for the full duration of the study * Age \> 18 years * Clinical evidence of perfused central retinal vein occlusion. A central retinal vein occlusion (CRVO) is defined as an eye that has retinal hemorrhages and a dilated retinal venous system in all 4 quadrants. Other evidence of a CRVO may include telangiectatic capillary bed and collateral vessels at the optic nerve head. * Central macular edema present on clinical examination and OCT testing with a central point thickness and/or central 1mm subfield thickness \> 250 microns. * Visual acuity score greater than or equal to 19 letters (20/400) and less than or equal to 73 letters (20/40) by the ETDRS visual acuity protocol. * Media clarity, pupillary dilation and patient cooperation sufficient to allow OCT testing and retinal photography Exclusion Criteria: * Pregnancy (positive pregnancy test) or known to be pregnant; also pre-menopausal women not using adequate contraception. * Participation in another ocular investigation or trial simultaneously * Uncontrolled hypertension * Any condition that, in the opinion of the investigator, would preclude participation in the study (e.g. chronic alcoholism, drug abuse) * Significant diabetic retinopathy (greater than moderate NPDR) or macular edema associated with diabetic retinopathy * Evidence of vitreoretinal interface abnormality after ocular exam or OCT that may be contributing to the macular edema * An eye that, in the investigator's opinion, has no chance of improving in visual acuity following resolution of macular edema (e.g. presence of subretinal fibrosis or geographic atrophy) * Presence of another ocular condition that may affect the visual acuity or macular edema during the course of the study (e.g. AMD, uveitis, Irvine-Gas) * Evidence of neovascularization of the iris or retina (presence of ischemic CRVO) * Evidence of central atrophy or fibrosis in the study eye * Presence of substantial cataract, one that might decrease the vision by 3 or more lines of vision at sometime during the study. * History of grid/focal laser or panretinal laser in the study eye * History of vitreous surgery in the study eye * History of use of intravitreal, peribulbar, or retrobulbar steroids within six months of the study. * History of cataract surgery within 6 months of enrollment. * History of YAG capsulotomy within 2 months of the surgery. * Visual acuity \<20/400 in the fellow eye * Uncontrolled glaucoma (pressure \>30) despite treatment with glaucoma medications. * History of cerebral vascular accident or myocardial infarction within 3 months prior to Day 0.