In a recent article,1 The Central Vein Occlusion Study Group described 3 patients who had bilateral occlusions at the time of their first visit to a physician; however, the authors did not state whether these occlusions were simultaneous or not. Later in the article, they stated that in patients "with simultaneous bilateral CRVOs [central retinal vein occlusions], the possibility of hyperviscosity should be considered."
Sanborn GE. Bilateral Central Retinal Vein Occlusions. Arch Ophthalmol. 1998;116(2):260-261. doi: