Webster Dictionary(0.00 / 0 votes)Rate this definition: Freebase(0.00 / 0 votes)Rate this definition: Crenulation or Crenulation cleavage is a texture formed in metamorphic rocks such as phyllite, schist and some gneiss by two or more stress directions resulting in superimposed foliations.
Retinal vein occlusions typically occur in older patients with a history of high blood pressure and atherosclerosis. Other causes of retinal vein occlusion include vasculitis, clotting disorders, and medications such as oral contraceptive pills.
There are only 2 likely causes of the vitreous hemorrhage in this scenario. Bleeding with a retinal tear or bleeding without a retinal tear. Remember that retinal tears can cause retinal detachments. Retinal detachments are potentially blinding and will require surgery to repair.