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.
1 A retinal vein occlusion is sometimes referred to as an âeye strokeâ because itâs a blockage of blood flow from your retina back to your heart. 2  This eye disease results in sudden blurred vision or a loss of vision.  Retinal vein occlusion canât be cured.