Bilateral retinal branch vein occlusion.

The incidence and predisposing factors for bilateral branch vein occlusions were evaluated in a retrospective study. Complete medical and ocular histories of 49 patients with angiographically proven branch vein occlusion were studied. Nine of these patients had bilateral vein occlusions that were unsuspected clinically. Hypertension was the only significant predisposing risk factor for this occurrence. The relationship between control of the hypertension and retinal vascular disease could not be evaluated in this study.