Occlusion of the veins draining blood from the retina. May occur as the vein leaves the eye at the optic disc (central retinal vein occlusion) or in a peripheral vein (branch retinal vein occlusion). Reduced blood flow usually causes impairment of retinal function and reduced vision. More common in elderly, those with high blood pressure, high cholesterol or diabetes, or high intra-ocular pressure. Lack of oxygen within the retina may in time lead to formation of abnormal blood vessels with risk of bleeding or glaucoma.
Clinical Features
Sudden painless loss or reduction in vision in one eye
May affect whole of vision or a portion such as the centre or a quadrant
Onset of floaters or pain and inflammation suggests development of abnormal new blood vessels
