Through medical chart review, we identified sex, race, diabetes, hypertension, and high cholesterol status as general demographic variables that put our new metric in context. We also evaluated whether patients had glaucoma, cataract, a posterior chamber intraocular lens, and, in the diseased eye only, epiretinal membrane or neovascularization of the optic disk. We subdivided BRVO patients on the basis of the location of their occlusion—superior or inferior—and calculated duration of RVO as the time between first diagnosis and measurement of blood flow. Before the blood flow measurement, we determined whether patients had received surgery, injection, or laser treatment on either eye. After the measurement, we identified patients who were prescribed or received injection within three months of that date. Total number of injections takes into account all injections the patient received for RVO, both before and after the measurement. Finally, we examined central macular thickness (CMT), intraocular pressure (IOP), and best-corrected visual acuity at the time of blood flow measurement (month zero) and repeated these measurements one and three months later on a subset of patients. CMT was measured on an OCT Spectralis (Heidelberg Engineering, Heidelberg, Germany) and IOP was measured using a Tono-Pen (Reichert Inc., Depew, New York, USA).