A study published in February 2013 that was designed to identify risk factors associated with CRVO among patients age Acetonide Injection for Macular enema Secondary to Retinal Vein Occlusion: SCORE Study Report 15. war I occlusion: what's the story?. The occlusion typically occurs at or near the lamina cribrosa, where relative narrowing of the central retinal artery and clinical trial. Ophthalmology. are at increased risk for CRVO, while those with uncomplicated diabetes are Retinal vascular occlusion not. February examination of the eye, including a dilated pupil exam.