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The most common causes are central retinal vein occlusion and proliferative diabetic retinopathy. Other potential causes include occlusive disease of the carotid artery, leading to ocular ischaemic syndrome, central retinal artery occlusion, branch retinal vein occlusion, longstanding uveitis and retinal detachment, and intraocular tumours such as choroidal melanoma and retinoblastoma.
Symptoms
In the early stages of the disease process, symptoms may be conspicuous by their absence. As the condition becomes established and intraocular pressure rises, the patient may complain of poor vision, haloes around lights, a red eye, pain and photophobia.
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