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This may present as a sudden painless loss of vision. It is less common than an occlusion of a branch vein and is less abrupt than a central retinal artery occlusion.
Elderly patients tend to be affected more severely since the venous obstruction is often compounded by a deficient retinal arterial supply - haemorrhagic retinopathy.
A meta-analysis suggested that DM is a risk factor for retinal vein occlusion (RVO) (1)